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Kenny is a Staff Writer at Sleepopolis and a certified sleep science coach. He tests the good, the bad, and the ugly of all things sleep, so you can skip the trial and error and jump straight into a good night’s rest. Kenny graduated from William Peace University with a degree in English and a minor in communication. Outside of testing and writing about mattresses, he enjoys hiking, biking, or avoiding the pit at your local heavy metal concert.
Sosha Lewis is a senior staff writer for Sleepopolis and a certified sleep science coach. Lewis is happy that she is able to combine her love of sleep with her love of writing. Lewis also has had articles featured in The Washington Post, Huffington Post, MUTHA Magazine, Charlotte Magazine, and The Charlotte Observer. Her weekly column, Soshally Awkward, is featured on the nationally-syndicated radio show, Bob & Sheri.
She lives in Charlotte, NC with her husband, daughter, and lovable trash-panda of a dog, Olive.
Riley is a staff writer and Certified Sleep Science Coach at Sleepopolis. She’s a firm believer that there’s nothing better than a good night’s sleep. Riley graduated from Elon University with a degree in journalism and creative writing. In her free time, she loves to paint, cook, and spend time with family (especially her pets).
Dan is a Performance Editor and Certified Sleep Coach at Sleepopolis, where he writes and edits mattress roundups to give readers the most up-to-date information on sleep products. In 2020, Dan earned his MFA In Playwriting from UT Austin, and his plays have been seen around the country in Chicago, Austin, Washington D.C., and elsewhere. He’s also a pop-culture fanatic, having written for publications such as The A.V. Club, Consequence, Pitchfork, and Vox. He co-hosts two popular horror podcasts on the Bloody Disgusting Podcast Network — The Losers’ Club: A Stephen King Podcast and Halloweenies: A Horror Franchise Podcast. When he’s not catching up on the latest King novel, you can find Dan in and around Brooklyn walking his dog Hank, seeing a play with his wife, and going to way too many concerts.
For the 14 percent of Americans who report always feeling uncomfortably hot at night, finding the perfect cooling bed sheets can be a game-changer. But with fabrics, weaves, and brands galore, narrowing down the best cooling sheets is a challenge. That’s where I come in.
Alongside the expert team at Sleepopolis, I’ve tested and reviewed dozens of sheet sets to uncover the ones that truly stand out for breathability, moisture control, and overall comfort. Each pick on this list offers high-quality materials and thoughtful construction designed to help you stay cool, whether it’s the peak of summer or you just run warm year-round.
At Sleepopolis, our team of certified sleep science coaches and product testers has hands-on experience with over 300 mattresses and sleep accessories. Our data and personal insights have helped more than 60,000 sleepers build their perfect sleep setup. To ensure our recommendations are as accurate and reliable as possible, I also worked with our Chief Medical Advisor Dr. Raj Dasgupta, MD, FACP, FCCP, FAASM, who reviewed our methodology and final picks.
Keep reading to discover which cooling sheets earned top marks and why they might be your new favorite bedding.
Our Top Pick: Saatva Organic Sateen Sheet Set
The Saatva Organic Sateen Sheet Set is my pick for the best cooling sheets thanks to its breathable, lightweight feel and high-quality, certified organic cotton. With deep pockets, strong elastic, and a luxuriously smooth finish that only improves over time, this set is a standout option for hot sleepers who want sustainable luxury that lasts.
Disclaimer: Please note that the content in this article is meant for informational purposes only and should not be construed as medical advice or serve as a substitute for seeing a medical professional regarding any sleep problems you may have. Please see your doctor regarding any urgent medical issues.
What I Looked for in the Best Cooling Sheets
My fellow product testers and I spent several weeks sleeping on different bedding sets, paying close attention to how they performed in warm conditions, to find the best cooling sheets on the market. We evaluated each set based on cooling performance, fit, and material quality. Here’s a closer look at what we prioritized and why it matters.
Temperature Regulation: Cooling sheets should help prevent you from waking up in a sweat. We recommended sets that felt cool to the touch, facilitated airflow, and featured moisture-wicking properties.
Materials: The feel, performance, and longevity of a sheet set all start with the fabric. We gave higher scores to sheets made from high-quality, cooling-friendly materials, such as bamboo viscose, Tencel lyocell, and percale-woven cotton.
Fit: Even the most breathable sheets won’t perform well if they don’t stay in place. That’s why we prioritized deep-pocket designs and strong elastic edging. These extras help ensure a snug fit on thick or layered mattresses.
Saatva sheets are woven from 100 percent long-staple organic cotton into a 300 thread count, which is intended to offer a feel that’s soft, durable, and breathable.
With its Organic Sateen Sheet Set, Saatva has created sheets that are equal parts luxurious, ethical, and durable, which is why they are my top pick for the best overall cooling sheet set. These sheets are sleek, soft, and made with 100-percent certified organic cotton. After thoroughly testing these bed sheets over numerous weeks, certified sleep science coach Sosha Lewis gave them a score of 4 out of 5 or higher in temperature regulation, durability, materials, and fit.
Naturally, the Saatva Organic Sateen Sheet Set wouldn’t be my top pick if it didn’t keep things cool and comfortable. While testing the Saatva sheet set, Sosha appreciated how breathable and lightweight the organic cotton felt and gave them a strong 4 out of 5 in the temperature regulation category.
The Saatva Organic Sateen Sheet Set, waiting to be unboxed.
“These sheets keep both my husband and me perfectly comfortable through the night,” Sosha said. “Whether you sleep hot, cold, or somewhere in between, I think you’ll be happy with them.”
Sosha was also wowed by the Saatva Organic Sateen Sheet Set’s durable materials and flexible fit. She awarded it a 4 out of 5 in the materials category and a perfect 5 out of 5 for fit and durability, thanks to its deep-pocket construction and strong elastic build that resists pilling and tearing.
“I really love how well these sheets fit my bed,” Sosha said. “I have a 14-inch mattress, and they’ve stayed securely in place, even with my very restless husband tossing and turning. The fabric also feels impressively durable. After multiple washes, there’s been no pilling at all, which makes me confident these sheets are made to last.”
Sosha’s main critique of the Saatva sheet set was that it took a little time to break in. The sheets had a noticeable new-product smell out of the box, and she felt they weren’t as immediately comfortable as expected, especially at a $275 price point for a queen set. However, after a few washes and nights of use, the odor faded, the fabric softened, and her overall impressions improved significantly. By the end of testing, she had raised her scores across the board.
Bamboo sheets are gaining popularity due to their natural hypoallergenic properties, superior cooling abilities, and smaller environmental footprint. If you’re someone who prioritizes a cooler sleep environment and sustainability, the Cariloha Classic 4-Piece Twill Sheet Set delivers on both fronts. Product tester Riley Otis awarded this sheet set 4.5 stars or higher for temperature regulation, materials, and fit.
Made from bamboo viscose, the Cariloha sheet set is nice and breathable. Despite being thicker than other options on this list, the sheets had a soothing, cool-to-the-touch feel that kept Riley and her partner from overheating at night. She gave these sheets a 4.5 out of 5 in the cooling category because she slept through the night and woke up sweat-free.
“I thought the sheets did a great job of regulating our body temperature and preventing us from feeling trapped in a sauna,” Riley said. “These are comfy bamboo sheets overall and could be good for people that sleep hot.”
The bamboo viscose also carried these sheets to a perfect 5 out of 5 materials score. Over a few weeks, Riley put them through the wash multiple times and found that they did not rip, pill, or tear after numerous cycles.
“Overall, these sheets seem very durable,” Riley said. “While they are not very stretchy, the weave seems very strong and unlikely to rip or pill over time.”
Riley also gave the Cariloha 4-piece Twill Sheet Set a 4.5 out of 5 in the fit category. Despite losing half a point for the lack of stretchiness, they are still deep pocket sheets that can fit mattresses up to 16 inches tall. Riley had no trouble putting the fitted sheets on her 10-inch mattress but noted that she had to tuck in some loose fabric to prevent them from bunching.
Aside from some slight bunching on shorter mattresses, Riley’s only other potential critique was the thickness of the sheet set. While the bamboo viscose fabric feels cool to the touch and excels at wicking away moisture, the material itself may be too thick for those with memory foam or pillow-top mattresses, which already tend to retain heat.
Luxury bed sheets should feel premium without being a hassle to put on and maintain. Fortunately, the Luxome Luxury Sheet Set delivers on every front: an elegant feel, exceptional temperature control, and thoughtful design details that elevate them above the competition. Product tester Matt Schickling gave the Luxome set 4.5 stars or higher across all of our core testing categories — temperature regulation, materials, durability, and fit — making it one of the highest-scoring sheet sets in our lineup.
A key factor in the Luxome’s cooling performance is the viscose from bamboo fabric, which Matt praised for both its temperature-regulating capabilities and luxurious feel. It’s breathable, moisture-wicking, and incredibly soft, earning a perfect 5 out of 5 in the materials category and an impressive 4.5 out of 5 for its temperature regulation.
Our tester grabs the corner strap on a LUXOME Luxury Sheet
What stood out most to Matt was how noticeably cooler and more comfortable the sheets made his bed feel.
“These sheets have made a big difference for me,” he said. “I tend to sweat at night, and I haven’t had that problem in weeks. Even on hot nights before we started running the air conditioning, these sheets felt crisp and cool.”
He was also impressed with the construction and attention to detail. The sheets have a subtly stretchy feel and minimal seams, with strong stitching that holds up well through repeated washes. As a restless sleeper, Matt especially appreciated the secure fit and built-in corner bands, which kept the fitted sheet anchored throughout the night.
“The supportive corner bands are a real game-changer,” he said. “I toss and turn a lot, and these sheets haven’t popped off the corners. The pockets are also deep enough for taller mattresses.”
While the $185 price tag for a queen set places Luxome firmly in the luxury category, Matt felt it was well worth the investment. The only real drawback? The brand’s email-only customer service may be a concern for folks who prefer real-time support.
Still, for shoppers willing to splurge on high-quality cooling sheets that look and feel luxurious, the Luxome Luxury Sheet Set is hard to beat.
For many sleepers (myself included), the worst part about washing your bedding is having to put the fitted sheet back onto the mattress. Fortunately, deep pocket sheets have wide, stretchy borders that take the headache out of making your bed. The Cuddledown 400 Thread Count Solid Sateen Sheet Set is available in two pocket depths: 16-inch and 21-inch, making them some of the most user-friendly sheets our testers have ever tried. Product tester Riley Otis rated them 4.5 out of 5 or higher in fit, temperature regulation, and materials.
While testing the Cuddledown sateen sheet set, Riley found that these sheets easily wrapped around her entire mattress with some material to spare. She gave the 16-inch version of this sheet set a 4.5 out of 5 for fit, as she was able to secure it to her mattress without any hassle and with minimal excess fabric to tuck in.
Our tester feeling a Cuddledown Sateen Sheet Set.
“I paired the 16 inch fitted sheet with my 10-inch mattress and thought there was more than enough room,” Riley said. “I definitely had some room to spare, but the excess fabric was easy to tuck in. I never thought my bed was swimming in the fitted sheet, and it wasn’t sliding around when I switched between sleeping positions at night.”
Sateen sheets have a silky-smooth, lustrous finish that feels luxurious against the skin. While they are typically known for their softness, sateen sheets often offer excellent breathability and temperature regulation, making them a strong option for hot sleepers. For that reason, Riley gave these sheets a perfect 5 out of 5 in the materials and temperature regulation categories.
“I thought these sheets did a great job keeping me cool,” Riley said. “They felt super-breathable and cool to the touch. I appreciate how lightweight they are without feeling thin and fragile.”
The only potential downside Riley noted about the Cuddledown sheets was their initial stiffness when first trying them out. However, this stiffness went away after sleeping in them for a couple of nights.
Tencel is a textile derived from eucalyptus and is known to regulate temperature and help wick away moisture. The Buffy Breeze Sheet Set, available from Amazon and the Buffy website, is made entirely from Tencel and offers a silky-smooth, breathable feel that’s ideal for hot sleepers. Our product tester Dan Caffrey was extremely impressed with these sheets across the board and awarded them a rating of 4 out of 5 or higher in terms of temperature regulation, fit, and materials.
After spending some time with the Buffy Breeze Sheet Set during a particularly hot summer week, Dan quickly settled on a 5-star temperature regulation score for these sheets. He appreciated how cool-to-the-touch the sheets felt without being abrasive or detracting from their soft and indulgent feel.
Our tester draping a Buffy Breeze sheet over his bed.
“Buffy designed these sheets with Tencel to live up to the ‘Breeze’ in the name, and they certainly do,” Dan said. “I highly recommend the Buffy Breeze set for hot sleepers.”
Our fit category considers not just whether the sheets match the mattress dimensions but also how easy they are to put on and keep in place. Dan gave the Buffy Breeze Sheet Set another perfect 5 out of 5 in the fit category, praising its user-friendly design and deep pockets.
“I admittedly am not the best at securing new sheets to a bed,” Dan said. “Thankfully, Buffy made it easy by including straps on each corner. I wish all sheets had these.”
Finally, Dan praised the Buffy Breeze set’s high-quality materials, noting that the sheets feel soft yet sturdy. He appreciated the clean stitching and overall craftsmanship, ultimately giving the set a 4.5 out of 5 for materials quality.
Overall, Dan was highly impressed with the Buffy Breeze Sheet Set. His only reservations were the price and the limited customer service options. At $200 before any discounts, the set may be too costly for budget-conscious shoppers. While Buffy offers a generous 50-day sleep trial and a 3-year warranty, Dan noted that the only way to reach customer support was via email, which could be a drawback for those seeking immediate assistance.
With nearly half of American adults sleeping on a queen-sized mattress (and king size and California king beds not far behind), fit is a major consideration when shopping for cooling sheets. Fortunately, the Brooklinen Luxe Sateen Core Sheet Set checked all the right boxes for larger mattresses while delivering impressive cooling performance and a soft, high-quality feel. After personally testing these sheets for several months, I awarded them a 4 out of 5 or higher in materials, fit, and temperature regulation.
Our tester is blissed out on Brooklinen Luxe Sateen Sheets.
One of the first things I came to appreciate about these Brooklinen sheets was how well they balanced lightness and resilience. The sateen weave feels thin and breathable but not flimsy. Despite their lightweight feel, the sheets held up well after multiple washes, showing no signs of fraying or pilling. I gave them a 4.5-star material score because of their silky finish and ability to withstand regular use.
One area where these Brooklinen sheets really shine is fit. I sleep on a Titan Plus Elite mattress, which is 14.5 inches thick, and these sheets had no trouble wrapping securely around it with room to spare. The fitted sheet didn’t budge throughout the night, which earned it a perfect 5 out of 5 in the fit category.
The cooling performance was equally impressive. These sheets are breathable, smooth, and weightless. I am a notoriously hot sleeper, and these sheets helped me ward off night sweats, even on warmer nights. They’ve more than earned their spot in my regular sheet rotation, as well as a 4 out of 5 for temperature regulation.
If there’s a downside, it’s the price: $189 for a queen set (before promotions) may be steep for some. And while the design is simple, it’s the performance and quality that make these sheets worth the investment.
If you’re looking for the crisp, hotel-like feel of classic cotton sheets with standout cooling performance, the Parachute Home Percale Sheet Set earns my pick for Best Percale Cotton Cooling Sheets. This set proved its value under extreme real-world conditions — performing so well that tester Cait Giddings awarded it a perfect 5 out of 5 in nearly every category, including temperature regulation, materials, and fit.
Cait tested these sheets during a week-long summer power outage in Austin, Texas, when outdoor temperatures soared past 105 degrees and indoor temps climbed into the 90s. With nothing to cool her down but her trusty box fan and the Parachute percale set, she was genuinely impressed by how cool, crisp, and breathable the sheets remained night after night, giving them a perfect 5 out of 5 for temperature regulation.
A close look at a Parachute Home Percale Sheet Set.
“The temperature inside my house was over 90 degrees one night, so I slept directly on top of the flat sheet,” Cait said. “These sheets were the only thing cooling me down and protecting my sanity.”
The percale weave, known for its tight one-over-one-under structure, delivers a light, smooth-to-the-touch matte finish without feeling slick. This construction increases airflow and improves long-term resilience, earning the set a flawless 5 out of 5 for materials. Cait found that even after heavy use and repeated washes, the fabric retained its crispness and structure, a much-needed quality in any summer-ready set.
Fit was another category where the Parachute sheets shined, earning another perfect 5 out of 5. The sheets fit snugly on Cait’s queen-sized mattress. Meanwhile, she was able to insert her pillows into the envelope-style cases without hassle.
“Each pillowcase wrapped entirely around the pillow with the opening in the middle and the pillow tightly stuffed inside, so there are no wrinkles and no risk of it sliding off,” she said.
Unfortunately, at $269 for a queen-sized set, the Parachute Home Percale Sheet Set may be too steep an investment for some shoppers. However, for folks in particularly hot climates, it delivers a luxury-level sleep experience that holds up under pressure.
The Nest Bedding Kids Tencel Sheet Set earned 4 out of 5 stars or higher in temperature regulation, fit, and materials during our testing, making it a reliable and thoughtfully designed choice for active children who tend to sleep hot. Tested by reviewer Kate Meier and her energetic son, this sheet set proved to be a significant upgrade over standard cotton bedding in both comfort and performance.
Kids tend to stay active right up until bedtime, which can leave them overheated and restless once the lights go out. An effective set of cooling sheets can make a real difference. Fortunately, the Nest Tencel sheet set features Tencel lyocell, a eucalyptus-derived fiber known for its softness and natural moisture-wicking properties.
A close look at the stitching on a Nest Bedding Kids Tencel Sheet.
“Tencel lyocell sheets are naturally cooling, and these are no different,” Kate said. “These sheets are breathable and super soft. I would say they are a big step up from your run-of-the-mill cotton sheets.”
Kate awarded the sheets a 4 out of 5 in materials, noting that while they weren’t the coolest to the touch among all the Tencel sheets she’s tried, they offered noticeable improvements in airflow and softness compared to typical kids’ bedding. The fabric felt durable but still light enough for year-round comfort.
She was also impressed with how well the sheets fit her son’s full-size bed, giving them a perfect 5 out of 5 in the fit category. Despite all the flipping, rolling, and jumping, the sheets stayed firmly in place without slipping or bunching.
“My son rolls around in his sleep and sometimes wakes up upside-down,” Kate said. “Surprisingly, these sheets haven’t slipped off the mattress yet.”
The only minor drawback Kate noted was that the sheets weren’t quite as instantly cool to the touch as some higher-end Tencel options. However, they still performed exceptionally well for a children’s set, especially compared to more traditional cotton choices.
If you couldn’t find what you were looking for in the list above, consider taking a look into my best cooling sheet sets runners-up. These are sheets that excelled in one or more of our key criteria and just barely fell short of the options on my main list.
The Eucalypso Classic Sheet Set is a strong choice for anyone seeking the smooth, breathable feel of Tencel. Despite being thick and impressively durable, these sheets still delivered a noticeably cool sleeping experience. That said, our expert testers deducted points due to a slightly awkward fit that didn’t sit quite right on their mattresses.
Known for premium-quality sleep products, Sleep Number doesn’t disappoint with its True Temp Sheet Set. These sheets excelled in adapting to body temperature fluctuations, helping our testers stay comfortable whether they were running warm or cool. However, given the high price point, we found other sets that offered better cooling performance overall.
How We Picked and Tested These Cooling Sheets
To get a good idea of how each of these sheet sets would perform for hot sleepers, our product testers used them for an extended period. Our testers slept on them in various weather conditions and washed them multiple times to grade their comfort and durability. We evaluated how well each set cooled things down, held up after multiple washes, and fit on different types of mattresses.
Tester Kenny Timper napping with the dog on a Feathered Friends 700 Bavarian Down Comforter.
Temperature Regulation
Your bed sheets should effectively regulate body heat to promote restful sleep, especially if you tend to overheat at night. Overheating, night sweats, and disrupted rest are common concerns, so we focused on each sheet set’s ability to remain cool and wick away moisture.
Our testers evaluated how sheets felt after a night’s sleep, particularly in warmer conditions. We also examined how well the materials resisted heat buildup, even when layered under comforters or heavy blankets.
Materials
The quality and type of materials used in cooling sheets significantly impact their performance. We sought out fabrics that are naturally soft, breathable, and moisture-wicking. And although comfort and cooling were our primary focus, we also evaluated how well each material held up after repeated washing to ensure long-term durability.
A close look at the Buffy Breeze pillow case.
During testing, we paid special attention to materials known for their cooling properties, such as bamboo viscose, Tencel lyocell, and percale-woven cotton. We also considered linen and performance-blend fabrics.
“When choosing bedding, consider the fabric type, thread count, and weave,” says Dr. Dasgupta. “Natural materials like cotton and linen are typically more breathable, and higher thread counts often mean softer, longer-lasting sheets.”
Fit
Sheets that slip off or bunch up can ruin a good night’s rest, particularly for those who move frequently in their sleep. Our testers gave higher ratings to sheet sets that fit their beds properly with zero to minimal disruptions.
A LUXOME Luxury Sheet with a strapped down corner.
To evaluate fit, we tested sheets on a variety of mattresses, including thick models with toppers and cooling pads. We recommended deep-pocket designs and elasticized edges that could securely wrap around layered cooling mattresses without shifting.
What to Consider When Buying Cooling Sheets
In addition to feel and durability, there are other factors to consider when shopping for cooling sheets. Here are a few more tips to keep in mind when shopping for the best cooling sheet set.
Your Mattress
The size and construction of your mattress influence how your sheets fit, both literally and functionally. If you have an oversized mattress, especially one with a plush pillow top or added cooling layers, you’ll want to look for deep-pocket sheets designed to accommodate extra height without slipping off.
Our tester Kenny Timper enjoying the Brooklinen Luxe Sateen Sheets.
The materials you choose should also complement the feel of your mattress. If your mattress retains heat or has a memory foam core, we recommend using more breathable sheet materials, such as bamboo viscose or Tencel, to help offset that warmth. If your mattress already has a firm, cool feel, you can likely get away with thicker, cozier sheets.
Certifications
If you’re concerned about chemical exposure, synthetic materials, environmental impact, or ethical labor practices, third-party certifications can offer peace of mind. While they aren’t mandatory, these certifications indicate that the sheets have met specific standards in categories like safety, sustainability, or social responsibility.
Look for trusted labels such as OEKO-TEX Standard 100, GOTS (Global Organic Textile Standard), FSC (Forest Stewardship Council), and CertiPUR-US. Sheets with these certifications are an excellent choice for eco-conscious shoppers or anyone seeking peace of mind regarding fabric safety and sourcing.
Care Instructions
Proper care ensures the performance and longevity of your cooling sheets. Materials like bamboo or Tencel can be more delicate and require special care, such as washing on a gentle cycle, avoiding high heat, or air drying.
Our tester inspecting the tags on a fitted sheet.
Before purchasing, check the manufacturer’s care guidelines to make sure they align with your routine. If you wash your bedding often due to night sweats, allergies, or pets, opt for machine-washable and dryer-safe sheets. Choosing sheets that match your maintenance style can extend their lifespan and help them maintain their cooling properties over time.
Customer Reviews
Customer feedback can give you real-world insights into how sheet sets perform. Reviews often highlight consistent patterns, such as whether sheets sleep cool throughout the night, retain softness after washing, or fit snugly on thicker mattresses.
As you browse, look for recurring themes. If many reviewers mention that a sheet set stayed cool in hot climates, didn’t trap sweat, and held up to weekly washing, it is likely a quality product. On the other hand, if you notice repeated complaints about poor fit, overheating, or pilling, that should raise a red flag.
Best Cooling Sheets FAQs
What sheets keep your body cool?
Sheets made from breathable, moisture-wicking fabrics like bamboo, Tencel, linen, and long-staple cotton are best for keeping your body cool. These materials allow for better airflow and help dissipate heat throughout the night.
Do cooling bed sheets really work?
Yes, cooling sheets are designed with breathable weaves and temperature-regulating materials that help reduce heat buildup. They’re especially effective for hot sleepers or those in warmer climates.
Can you put bamboo sheets in the dryer?
Yes, most bamboo sheets can go in the dryer on a low heat or delicate setting. However, high heat can damage the fibers over time. When in doubt, it’s best to follow the care instructions on the label or manufacturer’s website.
Do bamboo sheets work better than cotton sheets?
Bamboo sheets are typically more breathable and moisture-wicking than traditional cotton. However, high-quality cotton (like percale weave) can also offer excellent airflow and durability.
Are linen sheets cool?
Yes, linen sheets can be breathable and effective at regulating temperature. High-quality linen sheets feel crisp and airy, making them a popular choice for hot sleepers.
What other cooling bedding accessories can you buy?
In addition to sheets, you can invest in cooling comforters, cooling mattress toppers, mattress pads, and cooling pillows. These products are often made with temperature-regulating gels, moisture-wicking fabrics, and breathable designs to enhance sleep comfort.