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Idle Gel Foam Mattress Review

Are you looking for a mattress that provides soothing pressure relief while keeping you cool all night long? If so, consider the Idle Gel Foam mattress! Its soft foam comfort layer is infused with a cooling gel to keep you from overheating. And for support, the Idle Gel Foam offers sturdy layers of polyurethane foam and high-density polyfoam.

So what’s all the hype about this mattress? To find out, I’m going to put it through a series of tests and see how it performs on things like pressure relief, motion transfer, and edge support. I’ll also check out its firmness level and construction.

If you’re short on time, you can head down to my review summary. Ready to dive in? Keep on reading!

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Idle Gel Foam
Idle Gel Foam
Idle Gel Foam

The Idle Gel Foam is an all-foam mattress that's great for back or side sleepers. Use code SLEEPOPOLIS25 to save $25 on top of the deal on the site!

Brand Snapshot

Founded in 2017, Idle Sleep’s mission is to create a luxurious sleeping experience. Based in the USA, the company sells a full line of mattresses (four in total), as well as bed sheets, pillows, and more.

Later on, I’ll see how it stacks up against three of Idle Sleep’s other mattresses: The Gel Plush, the Hybrid, and the Hybrid Latex. But first, let’s see what goes on inside the Idle Gel Foam!

What is the Idle Gel Foam Mattress Made Of?

The Idle Gel Foam mattress is built with what they refer to as “Cooling Buoyancy Foam,” a material that — much like memory foam — offers a pressure-relieving, contouring feeling. And thanks to the transition and foundation layers, you’ll feel some support while you sleep.

What intrigued me about the Idle Gel Foam is that it uses three layers of foam, all with varying degrees of firmness. Taken together, you’ve got a plush, yet durable mattress surface. Not to mention that it uses a cover and comfort layer with cooling properties to help prevent you from getting too warm at night.

Idle Gel Foam Mattress
The Idle Sleep Gel Foam in the Sleepopolis bedroom

To give you a closer look at these materials, let’s check out each layer!

Cover – To kick us off, we have a thin, breathable cover that helps you stay cool. And since it’s machine washable, keeping it clean should be a synch.

Comfort Layer – Next up is a 3” layer of Idle Cooling Buoyancy Foam. Infused with cooling gel, it has a slow response to pressure, just like memory foam. This helps alleviate tension as you sink into it. But since there’s not much bounce to this material, you may feel a little stuck as it contours to your body.

Transition Layer – After this, we come to a 2” transition layer of firmer polyurethane foam. Since this foam has a quick response to pressure, you won’t sink into it much. This layer is meant to ease you into the firmer foundation layer below.

Foundation Layer – Finally, we have a 7” layer of sturdy high-density polyfoam. This is a really firm material that a lot of the best bed-in-a-box mattresses use for support.

Idle Gel Foam Materials
The Idle Gel Foam uses cooling materials

What Does the Idle Gel Foam Mattress Feel Like?

So do all of these materials make up a comfortable mattress? To find out, let’s first check out its firmness.

You should know that firmness isn’t a one-size-fits-all scenario — your size, weight, shape, and other factors all determine your ideal level of firmness. So your preferences might not be the same as mine. For reference, I’m 5’10”, weigh 190 lbs., and prefer to sleep on my stomach.

Idle Gel Foam Firmness
The Idle Gel Foam has a nice medium firm feel

After lying on the mattress, I put the bed at a 6.5 out of 10 on the firmness scale, with 10 being the firmest. I would say that’s about the industry standard for a medium-firm mattress, the Idle Gel Foam is right around that mark.

The slow response to pressure from the comfort layer gave a ton of great pressure relief when I tried it on my back and side. I think back sleepers and side sleepers are especially going to enjoy this. And the cooling features help keep it from trapping body heat, which is a common problem with foam mattresses.

On the other hand, I don’t think this mattress is great for combination sleepers. I felt a bit stuck in the mattress when swapping positions, since it doesn’t give a bouncy feeling. Also, I think stomach sleepers are going to want something firmer than this for support.

Memorial Day Sale: Up to 50% Off Store-Wide!
Idle Gel Foam
Idle Gel Foam
Idle Gel Foam

The Idle Gel Foam is an all-foam mattress that's great for back or side sleepers. Use code SLEEPOPOLIS25 to save $25 on top of the deal on the site!

Testing the Idle Gel Foam Mattress

Firmness shouldn’t be the only factor that comes into play when choosing a mattress. Three other factors worth considering are pressure relief, motion transfer, and edge support. I put all of these factors to the test, and I’m pumped to share my results with you!

Pressure Relief

First up is the pressure relief test. A mattress with good pressure relief will help alleviate tension at the shoulders, hips, and lower back.

To get an idea of how well the Idle Gel Foam does at handling pressure relief, I used my handy pressure map device. By putting the pressure map on top of the mattress, I was able to see where pressure was relieved and where it wasn’t. For reference, blue means low pressure and red means high pressure.

Idle Gel Foam Pressure Map
I was impressed with pressure relief of the Idle Gel Foam

Back – I think this is a great mattress for back sleepers. My weight was evenly distributed when I was on my back, so I felt a relaxing mix of comfort and support. This was all thanks to the contouring feel of the comfort layer and the supportive feel of the lower layers.

Side – Once I rolled to my side, I felt some nice pressure relief at my hips and shoulders. As the pressure map shows, there was a slight amount of pressure at my shoulders, but it wasn’t enough to cause me discomfort. Generally, I recommend side sleepers go for something a bit softer like this to avoid tension from building up at their shoulders and hips. So overall, I think side sleepers will be really happy with this mattress.

Stomach – After switching to my stomach, I didn’t feel enough support at my hips and torso, despite the blue on the pressure map. Typically, I recommend stomach sleepers go with a firmer mattress to keep their shoulders in line with their hips and their spine aligned. With that in mind, I don’t think this mattress is going to be the best fit for stomach sleepers.

Idle Gel Foam Side Sleepers
Side sleepers will like the Idle Gel Foam

Motion Transfer

Next up is the motion transfer test. Basically, this refers to the amount of noticeable disturbance from one end of the mattress to the other. How well a mattress does with motion transfer can be really important if you share a bed, especially if your bedmate is a restless sleeper.

To test out the Idle Gel Foam’s motion transfer, I dropped a 10 lb. steel ball onto the mattress from three different heights. The 4” drop simulated tossing and turning in the bed, the 8” drop simulated getting out of bed, and the 12” inch drop simulated how it would feel if my bedmate wanted to jump on it.

I then reviewed the results from each drop. For reference, bigger lines equal more disturbance.

Idle Gel Foam Motion Transfer
I was pretty impressed with the Idle Gel Foam’s ability to isolate motion transfer

I think the Idle Gel Foam isolated motion pretty well. While there were some initial high spikes of disturbance for each drop, the soft foams helped to tamp it down quickly. This might be an issue if you’re a light sleeper, but for people who aren’t as easy to wake up, this shouldn’t be a problem.

Edge Support

The final test deals with edge support. I looked at the Idle Gel Foam’s edge support to determine if it’s likely to hold up when you sleep toward the end of the bed. Also, if you ever sit on the side of your bed, such as when putting on your shoes in the morning, you’ll probably want to consider a mattress with strong edge support.

Idle Gel Foam Back Sleepers
The Idle Gel Foam is good for back sleepers

To test out the edge support, I rolled to the end of the bed to see if it would collapse. I’m pleased to report that the edge support was sturdy enough to keep the mattress from caving in.

Since it offers decent edge support, the Idle Gel Foam lets you use all of the available space, making it feel that much bigger. This might be good if you decide to go with the full or queen models and want to make sure you can use the entire mattress.

Memorial Day Sale: Up to 50% Off Store-Wide!
Idle Gel Foam
Idle Gel Foam
Idle Gel Foam

The Idle Gel Foam is an all-foam mattress that's great for back or side sleepers. Use code SLEEPOPOLIS25 to save $25 on top of the deal on the site!

Other Idle Mattresses

Like I mentioned earlier, Idle Sleep makes three other mattresses. With that in mind, let’s see how it compares to the Idle Gel Plush, the Idle Hybrid, and the Idle Latex Hybrid!

Idle Gel Plush

  • I’d say this mattress is a bit softer than the Idle Gel Foam, thanks to its thicker layers of memory foam that let you sink in more.
  • While the Idle Gel Foam does a swell job with pressure relief, I think the Idle Gel Plush performs better in this area due to its thicker layers of soft foam.

Idle Hybrid

  • Unlike the Idle Gel Foam, the Idle Hybrid uses a layer of pocketed coils for support along with foam layers for softness — this is what makes it a hybrid mattress.
  • I think the bounce of this medium-firm mattress is much better than the Idle Gel Foam for back/side combination sleepers, since it allows for greater mobility when changing positions.
  • Interested in learning more? Check out my full review of the Idle Hybrid mattress!

Idle Latex Hybrid

  • I think the Idle Latex Hybrid’s coiled layer makes it a bit firmer than the Idle Gel Foam, which means you won’t get as much pressure relief from it.
  • Unlike the Idle Gel Foam, the Idle Latex Hybrid has some bounce to it. This gives it an “on-top-of-the-mattress” feeling, which is good news for combination sleepers who switch positions at night.
  • If you want more info on this model, head over to my full review of the Idle Latex Hybrid mattress!

Should You Buy the Idle Gel Foam Mattress?

Well folks, it’s now time to answer the all-important question: Is the Idle Gel Foam the best mattress for you? To help you decide, check out my final thoughts!

Idle Gel Foam Pros

  • I think back sleepers are really going to dig the pressure relieving capabilities of this mattress! And the firmer bottom layers will likely give them the support they want.
  • I also think this is a fantastic choice for side sleepers! Since it alleviates tension well, it will likely help them avoid shoulder and/or hip pain.
  • I think this mattress is likely going to help you sleep through the night without breaking a sweat, thanks to its breathable cover and cooling gel-infused comfort layer.

Idle Gel Foam Cons

  • I don’t think stomach sleepers are going to like its level of support. I think they’re likely to feel their hips and spine sink in uncomfortably deep, due to its soft comfort layer.
  • Since there’s not much bounce to this mattress, you might feel a little stuck if you change positions throughout the night. This could be a problem for folks who like alternating positions.
Idle Gel Foam
The Idle Gel Foam Mattress

How Much Does the Idle Gel Foam Cost?

Check out the full pricing of the Idle Gel Foam below, but don’t forget to check out our Idle Sleep coupon page for the latest discount!

Memorial Day Sale: Up to 50% Off Store-Wide!
Idle Gel Foam
Idle Gel Foam
Idle Gel Foam

The Idle Gel Foam is an all-foam mattress that's great for back or side sleepers. Use code SLEEPOPOLIS25 to save $25 on top of the deal on the site!

Twin38" x 75" x 12"$699
Twin XL38" x 80" x 12"$749
Full54" x 75" x 12"$899
Queen60" x 80" x 12"$999
King76" x 80" x 12"$1,149
California King72" x 80" x 12"$1,149

Idle Sleep Policies

  • Shipping – Free
  • Trial – 18 Months
  • Warranty – Lifetime
  • Financing – Available


Where are Idle mattresses made?

All Idle mattresses are proudly made in the USA.

Do you need a box spring with the Idle Gel Foam?

You do not need a box spring with this mattress, but you can use one if you want. This mattress will work well with most types of foundations.

Can you flip the Idle Gel Foam?

You should not flip this mattress. Idle Sleep has made it to be felt in a particular way, with the comfort layer at the top and the supportive layers at the bottom. So flipping it would probably be quite uncomfortable.

  • Materials
  • Comfort
  • Support
  • Value
  • Cooling
  • Edge Support
  • Trial
  • Warranty
Logan Block
Logan is the content director of Sleepopolis, which means he not only reviews new mattresses every week, but also curates all the comparisons, best of pages, and video guides on the site. He takes a straightforward, honest approach to his reviews and endeavors to give viewers an objective look at each new product he tries out. Logan has perfected his method by personally testing over 200 different mattresses, so he’s not only able to discern the overall vibe of a specific bed, but to contextualize its feel within the bed-in-a-box market as a whole. When he’s not hopping on a new bed or working with our editorial team to whip up an engaging sleep education guide, you can find him reading books on world history, walking his dog Pepper, or searching for the best cheeseburger in New York City.