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Brentwood Sierra Mattress Review

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In 2016 Brentwood completely revamped their line of mattresses, launching 9 brand new models. Among these 9 models included 3 memory foam, 3 latex, and 3 coil. Each set of 3 follows a good, better, best model and are situated for every budget.

In today’s mattress review, we’re taking a look at Brentwood Home’s Sierra mattress. The Sierra mattress is the good model on the memory foam side, positioned as a solid mattress, at an extremely affordable price point. So with all that said, let’s go ahead and dive in!

In a hurry today? Click here to skip to the review summary for the shortened version.



The Brentwood Home Sierra mattress is 8″ thick and contains 3 unique layers of foam.

  • Top layer (cooling & comfort) – 2″ of gel memory foam. The top layer is designed to provide both contour and cooling for the mattress. Infused with gel, the memory foam is able to pull heat away from the sleeping surface while providing a contoured feel around the sleeper.
  • Middle layer (support) – 2″ ventilated polyurethane foam. This layer was placed below the top layer of memory foam in order to provide the support for the sleeper. Additionally, the middle layer is ventilated in order to increase airflow in and out of the mattress, which aids in cooling as well.
  • Bottom layer (foundation) – 4″ of high density support foam. The bottom layer acts as the deep compression support for the sleeper as well as the foundational base for the mattress
Brentwood Sierra layers (top to bottom): 2" gel memory foam, 2" poly foam, 4" support foam

Brentwood Sierra layers (top to bottom): 2″ gel memory foam, 2″ poly foam, 4″ support foam


The cover of the Sierra mattress is a blend of polyester and wool. The combination feels durable, yet still has a soft feel. The cover has a traditional quilted design, but is still fairly subdued in the overall thickness. This gives it just a little bit of added softness, but still only creates a minimal level of sinkage and hug. The side panels are quite sturdy feeling, which gives me more confidence of the mattress’ durability and longevity, especially as it pertains to moving.

Close up shot of the Brentwood Sierra mattress

Close up shot of the Brentwood Sierra mattress

Aesthetically the cover is simple and takes the fairly standard approach, white on top and grey side panels. Being that this is a budget conscious mattress I don’t want to ding Brentwood for the simple cover. The simplicity is in line with the overall layered design and helps to keep costs lower. Despite the simplicity the cover feels and looks well made.

Firmness, Feel, & Support

The Brentwood Home Sierra mattress lands between a 6.5 out of 10 on the firmness scale (10 being the most firm). Brentwood designed this mattress as a “universal comfort” mattress, hoping to meet the needs of a vast majority of sleepers.

Brentwood Sierra firmness - 6-6.5 out of 10 on the firmness scale

Brentwood Sierra firmness – 6.5 out of 10 on the firmness scale

To begin with, the Sierra has a balanced and nice feel all around. The balanced levels of firmness, comfort, and support meshed well to create a stable sleeping environment for both me and my wife. Due to primarily sleeping on my stomach, I tend to need a little extra support around my lower back. The Sierra was able to provide this. My wife sleeps mostly on her side and back and also found the support to be sufficient.

Brentwood Home Sierra mattress, King size, platform bed

Brentwood Home Sierra mattress, King size, platform bed

There is not a dramatic contouring effect on the Sierra mattress. This mattress offers more of a floating feeling and does not have a whole lot of sinkage. At 8″ thick, Brentwood Home designed the Sierra with intentions of having an above average level of push back on the sleeper versus a deep level of sinkage. If you’re a fan of the deeper sinkage, Brentwood Home’s Coronado mattress is a good choice.

FAQ: How to choose a mattress?

One of the major benefits of the Sierra mattress is the response time. As a slightly firmer mattress, the top layer of gel memory foam and middle layer of polyurethane foam combine to offer a quicker response. Since the Sierra does have a little more push back it doesn’t create a depth of sinkage that would require a faster contour to be comfortable. The combination of a little faster response and a little less sinkage create an overall adaptive experience that feels closer to latex in terms of the speed and supportive changes.

Finally, cooling. As a thinner mattress than most, the breathability is a little easier with the Sierra mattress. The ventilated middle layer of foam allows a good level of airflow in and out of the mattress, which aids in this breathability as well. The thinner construction, slightly firmer feel, and subdued padded top layer all help to keep heat retention issues in check. Throughout my sleep tests on the Sierra mattress I never once noticed any heat trapping or hot spots.

Ultra close up shot of the Brentwood cover, label, and stitching

Ultra close up shot of the Brentwood cover, label, and stitching


All mattress reviews on Sleepopolis go through a short series of sinkage tests. These tests are deigned to provide you with insight on how the mattress will perform under various conditions.

  • Lying on back – as I lied on my back with my weight spread evenly across the mattress, I saw 1-1.25″ of sinkage.
  • Lying on side – while lying on my side I saw 1-1.5″ of sinkage.
  • Sitting on edge (conservative) – in a normal sitting position with my butt slightly off the edge of the mattress, I saw 3″ of sinkage.
  • Sitting on edge (aggressive) – as I sat normally on the direct edge of the mattress, I saw 3.5-4″ of sinkage.
  • Standing in the middle – with all of my weight placed at the middle of the mattress I saw 4.5″ of sinkage.

Please keep in mind, sinkage results will vary depending on your weight and body type. As a reference point, I am fairly uniform and weight about 140 pounds.

Angled view of the Brentwood Sierra mattress

Angled view of the Brentwood Sierra mattress


Twin XL$555
California King$1,045

Other Details

  • Shipping – free shipping within the US, most orders will arrive within 5-10 days, compressed in a box
  • Warranty – 25 years
  • Trial Period – 120 nights
  • Made in the USA

Should I Buy the Sierra Mattress?

I would recommend the Sierra mattress to sleepers who:

  • Enjoy a medium firm mattress – the Brentwood Home Sierra mattress falls between a 6.5 out of 10 on the firmness scale (10 being the most firm)
  • Want a thinner mattress – with an 8″ profile, the Sierra offers a sleeker more modern look for anyone who wants to get away from the bigger, bulkier mattresses. This is one of the more quality and higher performance foam mattresses I have seen that is less than 10″ thick.
  • Want above average edge support – as an all foam mattress, the edge support is notably one of the top features with the Sierra. Typically, an all foam mattress struggles with weight placed directly on the edge. The Sierra does a surprisingly good job holding stronger edges that are capable of supporting both close proximity sleeping and sitting.
  • Want a subtle hug – the medium to slightly medium firm feel create just enough pressure relief and softness, but do so with minimal sinkage and hug. Sleepers who don’t necessarily want pronounced sinkage and contouring hug, but still want just a touch of softness without completely floating above the mattress, will find the Sierra’s approach enjoyable.

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