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Amerisleep AS3 Mattress Review

If you’re considering an all-foam mattress, don’t miss this review of the luxury Amerisleep AS3. It promises relief for active individuals and a balanced feel, but how does it stack up?

Our Verdict: The Amerisleep AS3 is the company’s best selling model that was designed to accommodate all sleeping positions, weights, and lifestyles. Thanks to the Celliant cover that helps promote recovery, it’s specifically attractive to active people. It also minimizes motion transfer, making it a great option for couples who like a medium-firm foam mattress. 

Who the Amerisleep AS3 is Best For

Best For…

May Not be Best For…

Lightweight sleepers and average weight sleepers

✅Couples and co-sleepers who need motion isolation

✅Regular exercisers and athletes seeking improved overnight recovery

✅Side, back, stomach, and combination sleepers

✅Shoppers who value luxury features

People who want a responsive mattress

❌Those who sleep hot

❌Shoppers on a budget

Amerisleep AS3 In-Depth Review 

Amerisleep is a popular bed-in-a-box company that’s based in the U.S. and was established in 2007. The mattress brand offers five different models that vary in firmness setting and style (all-foam and hybrid). In this review, I’m focusing on the Amerisleep AS3, one of the brand’s most popular mattresses.

The AS3 is one of Amerisleep’s memory foam mattresses. It’s medium in firmness and is constructed with a memory foam comfort layer, a transitional layer of high-density polyfoam, and a support layer of high-density polyfoam. The AS3 also comes in a hybrid version that features a pocketed coil support layer instead of foam. Both models are 12 inches thick.

Both styles of the AS3 have many benefits, including close conforming, motion isolation for couples, and great durability. The bed’s cover also sets it apart from the crowd. It’s made from a blend of Celliant fabric, polyester, and spandex. The Celliant helps promote recovery via increased tissue oxygenation and circulation, body temperature regulation, and pain alleviation.

The AS3 and AS3 hybrid both cradle the body and make it feel like you’re sleeping “in” the mattress rather than “on” it. Both versions of the mattress are best for people who are lightweight or average weight, and we’ll explain why in our review below.

Amerisleep AS3 Highlights

As a luxury mattress, the Amerisleep AS3 has many qualities that help it stand out from the crowd. These are the highlights I think are most important to consider:

Celliant Blend Cover Promotes Recovery

  • Celliant fabric converts body heat into infrared energy and transmits it back to the body
  • Helps improve tissue oxygenation, boost blood flow, and regulate body temperature
  • Plus for athletes recovering from strenuous activity, regular exercisers, or individuals with physically demanding jobs

Versatile Firmness that’s Comfortable and Supportive

  • Medium firmness setting (5.5 out of 10 on the firmness scale) provides close conforming and spinal support
  • Thick memory foam comfort layer cradles the body, making it a best mattress for side sleepers
  • Lightweight sleepers and average weight sleepers will feel comfortable yet supported
  • Feels like you’re sleeping “in” the mattress rather than “on” it

Accommodates all Sleeping Positions/Styles

  • Side sleepers will have ample cushioning for the shoulders and hips along with spinal support
  • Back and stomach sleepers will feel comfortable and find support for their hips, shoulders, and low back
  • Combination sleepers with any primary sleep position will have just enough responsiveness to change positions without feeling “stuck” in the mattress
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Amerisleep AS3 by Sleeping Positions

Back Stomach Side
✅Great support in hips and lower back

✅Little to no sagging for lightweight to average weight sleepers


✅Adequate support for light and average weight

❌Heavy sleepers will have pressure on lower back and hips

✅Cushioning in the hips & shoulders

❌ Heavier sleepers could experience too much sinking

Back Sleepers 

Back sleepers need support in their hips and shoulders to prevent sagging, and the AS3’s dense transitional and support layer prevents this. Those in the lightweight category will experience no sagging at all, and average weight sleepers may experience slight sagging on the memory foam version.

We don’t recommend the AS3 hybrid or AS3 all-foam for heavyweight back sleepers, but average weight sleepers who feel uncomfortable on the all-foam version should find adequate support from the spring support system in the hybrid version. For other mattresses that are supportive and may work for larger back sleepers, check out our best mattresses for back sleepers. 

Stomach Sleepers

My review of the Amerisleep AS3 for stomach sleepers is very similar to my review for back sleepers. If you’re lightweight, you’ll sleep just fine and feel supported on either version of the AS3. If you’re average weight, you may want to consider the hybrid AS3, whose coil system can discourage sagging around the lower back and hips.

I don’t recommend the AS3 hybrid or AS3 all-foam for heavyweight stomach sleepers, as the bed simply isn’t constructed to support individuals or couples of that size. If you are a stomach sleeper that needs the hips lifted and spine supported, see our picks on the best mattress for stomach sleepers.

Side Sleepers

Side sleepers in the average weight and lightweight categories will find adequate cushioning for the hips and shoulders in this bed. The top layer of memory foam cradles the body to relieve pressure points, while the high-density polyfoam transitional layer and support layer prevents the spine from sagging too much in any area.

The result is the feeling of sleeping “in” the mattress without sinking too much. Keep in mind that the Amerifoam AS3 hybrid version may be slightly more responsive, but I think it has a very similar feel to the Amerifoam AS3 all-foam mattress because they share the same top memory foam layer. 

Pros & Cons of the Amerisleep AS3


  • Luxury, high-quality materials
  • Hybrid and all-foam options
  • Pressure relief
  • Motion isolation
  • Noise reduction
  • Celliant cover
  • Durable
  • Suits all sleeping positions
  • Generous warranty period (20 years)
  • Made in the USA


  • Price
  • Traps heat
  • Not responsive
  • Not suitable for heavyweight sleepers

Amerisleep AS3 Sizing and Specs

Twin 38” x 74” x 12” $1,099 58 lbs.
Twin XL 38” x 80” x 12” $1,149 63 lbs.
Full 54” x 75” x 12” $1,249 80 lbs.
Queen 60” x 80” x 12” $1,399 96 lbs.
King 76” x 80” x 12” $1,699 120 lbs.
California King 72” x 84” x 12”  $1,699 120 lbs.
Split King 38” x 80” x 12” (x2) $2,098 126 lbs.

Amerisleep AS3 Firmness

The Amerisleep AS3 mattress has a medium-firmness level, which corresponds to 5.5 on a scale of 1 to 10. Beds with a medium feel tend to be highly versatile, balancing a mix of pressure-relieving conforming with support. The AS3 is no exception to this rule.

The AS3 all-foam mattress and the AS3 hybrid mattress share the 5.5 firmness level and therefore have a similar feel. Their memory foam comfort layers are identical in height and materials. However, the pocketed coil base layer in the hybrid version makes the AS3 hybrid a little more responsive (bouncy) and supportive than the AS3 all-foam bed. Both mattresses will feel more like you’re sleeping “in” them rather than “on” them. The best mattress for combination sleepers or heavier sleepers may be a firmer mattress with additional support layers or coils to keep spines aligned. 

Amerisleep AS3 Construction

The Amerisleep AS3 all-foam bed is a luxury mattress that’s constructed with pressure-relieving, high-quality memory foam, and dense, supportive base materials. The foams are encased in a Celliant blend cover that’s designed to promote recovery for active individuals. Keep in mind that the AS3 hybrid has a layer of pocketed coils in place of the polyfoam bottom layer described below.

  • The cover is one of AS3’s standout features and is made from a blend of Celliant fabric, spandex, and polyester. It feels soft and stretchy to the touch and the Celliant helps sleepers’ bodies recover. It does this by retaining heat from the body and converting it into infrared energy, which, when transmitted back to the body, increases tissue oxygenation, regulates body temperature, alleviates sore muscles, and improves circulation.
  • The top layer of the AS3 is 3” of Bio-Pur foam, an open-cell memory foam that provides sleepers with noticeably close body-contouring. Because the foam’s open-cell structure, it’s designed to retain less body heat and help the mattress sleep cooler.
  • The transition layer of the AS3 is a 2” transitional high-density polyfoam layer that’s known as the Affinity layer. It’s denser than the top layer yet not as firm as the support layer, creating a barrier between the sleeper’s body and the firmer support layer for maximum comfort.
  • The bottom layer of the all-foam AS3 is 7” of high-density polyfoam that’s known as the Bio-Core base layer. This is a very dense and firm foam that helps prevent sagging, encourage spinal alignment, and stabilize the mattress.

Amerisleep Buying Experience

Shipping, Delivery & Returns

All AS3 beds ship free to the contiguous U.S. and typically arrive within 3 to 5 business days. Amerisleep beds ship as a bed-in-a-box, which means they’ll be compressed and rolled when they arrive at your home. 

After the mandatory 30-night break-in period, you can return your AS3 mattress for a full refund. If you opt for this, the company will arrange a courier to pick up the mattress from your home. You’ll also have the option to exchange the mattress for a firmer or softer Amerisleep model.

Sleep Trial Period

The AS3 comes with Amerisleep’s 100-night sleep trial, which allows sleepers to test out the bed and decide if it’s right for them. A 30-night break-in period is required, which means that you must wait at least 30 nights before qualifying for a free return or exchange.

Amerisleep will cover all costs associated with returning your mattress during this trial period, and you’ll receive a full refund if you decide it isn’t the right fit. Keep in mind that if you select the wrong size mattress, you won’t be eligible for a return or exchange.


The AS3 and AS3 Hybrid come with a 20-year warranty. This warranty is partially prorated, which means that coverage is non-prorated during the first 10 years. Non-prorated warranties allow sleepers to have the bed replaced at no extra cost.

During the last 10 years of the warranty, you’ll be required to pay 50% of the original mattress price if you find a defect. The warranty covers sagging, indentations, and other defects, but it’s only eligible if you have proper foundational support.


Amerisleep beds are available on the Amerisleep website and on Amerisleep also operates brick-and-mortar stores in Texas, Colorado, Oregon, and Arizona.

Other Models from Amerisleep 

  • AS1The cheapest Amerisleep mattress option. This firm mattress is great for strict back and stomach sleepers and some heavyweight individuals.
  • AS2—The best mattress from Amerisleep for stomach and back sleepers who like a medium-firm firmness level.
  • AS4—A medium-soft all-foam mattress for side sleepers who enjoy extra conforming and are average weight or lightweight. 
  • AS5—The softest and most expensive Amerisleep bed, with a soft firmness level that’s ideal for strict side sleepers in the lightweight and average weight categories.

See our full Amerisleep Mattress Comparison for more information!

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Amerisleep AS3 Rating and Conclusion

Mattress Nerd is giving the Amerisleep AS3 a 4.7/5. Overall, I really like the thoughtfulness that was put into the Amerisleep AS3 construction, and I think the fact that it’s the company’s best selling model speaks to its versatility and ability to suit all sleeping styles and most body types. The Celliant cover is a great plus for active individuals and athletes. Like most all-foam beds, it’s also a great pick for couples who need to limit motion transfer.

The only downside to this bed is that it’s in the higher price range for an all-foam model. There are hundreds of other high-performing memory foam beds on the market that are much more affordable, but if you’re not concerned about price and want a high-quality memory foam bed that’s been rated well by thousands of other customers, the Amerisleep AS3 may be the right option for you.

Looking for More Information on Amerisleep? 

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