Amerisleep AS3 Mattress Review

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The Amerisleep AS3 mattress is the most popular model from Amerisleep. It’s a versatile, all-foam mattress that could appeal to a variety of sleepers.

Wondering if the mattress is right for you? Read on for our comprehensive Amerisleep AS3 mattress review to find out! We’ll cover who might like this mattress (and who might not) as well as its firmness and feel, construction, and other performance metrics.

30% Off
Amerisleep AS3
Amerisleep AS3
Amerisleep AS3

The Amerisleep AS3 is the brand's most popular model and offers an excellent balance of comfort and support. Get 30% off the Amerisleep AS3 mattress by using code AS30

Amerisleep AS3 Mattress Overview

Amerisleep is all about offering options to its customers – they have five models that come in both all-foam and hybrid versions. These models range from very firm (AS1) to very soft (AS5). The Amerisleep AS3 is the Goldilocks of the bunch and is right in the middle of their firmness range.

The Amerisleep AS3 is a versatile mattress that’s suited to several kinds of sleepers, but it isn’t for everyone. Here’s a quick look at who might want the Amerisleep AS3 and who might not.

Who Might Like The Amerisleep AS3?

  • Back sleepers, who should enjoy a balance of comfort and spinal support
  • Fans of a medium-firm mattress
  • Folks who like a balanced foam feel

Who Might Not Like The Amerisleep AS3?

  • Stomach sleepers, who probably won’t get enough support
  • People who want a mattress that’s either very soft or very firm
  • Folks who like a slow-moving foam feel

Learn more about the Amerisleep line in our comprehensive Amerisleep review.

Amerisleep AS3 Mattress Firmness And Feel

When shopping for a new mattress, it’s critical to think about firmness and feel. These factors majorly influence whether a mattress is well-suited to your particular sleep preferences, including your primary sleep position(s). So let’s take a close look at the firmness and feel on the Amerisleep AS3!

How Firm Is The Amerisleep AS3?

We ranked the Amerisleep AS3 around a 6.5 out of 10 on the firmness scale. The industry standard for medium-firm is 6.5/10, so this suggests the Amerisleep AS3 is right around medium-firm. This makes sense given that the AS3 is right in the middle of the Amerisleep line of mattresses, which go from quite firm (AS1) to quite soft (AS5).

Note that firmness is a bit subjective and depends on body weight. For instance, heavier-weight sleepers might find that this mattress feels a bit firmer, while lighter-weight folks will probably feel that the AS3 is a touch softer.

Sleeping On The Amerisleep AS3 Mattress (Sleeping Positions)

The AS3 is Amerisleep’s medium-firm mattress, and this is the firmness that usually works best for back sleepers. So it’s no surprise that we felt great while back sleeping on this mattress. Our spine felt properly supported, while the top layer of Bio-Pur foam offered some gentle body contouring and pressure relief. Out of the Amerisleep models, the AS3 is one of the best mattresses for back sleepers.

Amerisleep AS3 - Back Sleeping

We also felt really comfortable while side sleeping on the Amerisleep AS3. The thick layer of Bio-Pur foam helped cushion our joints, and we felt almost no pressure on our shoulders and hips. Folks who like an even plusher mattress might want to consider the AS4 or AS5 models.

The Amerisleep AS3 did not feel like a great match for stomach sleeping. The thick layer of Bio-Pur foam allowed our hips to sink too far into the mattress, which pulled the spine out of alignment. Folks who sleep on their stomach will want to look for a more supportive mattress for stomach sleepers.

What Does the Amerisleep AS3 Feel Like?

The Amerisleep AS3 features a comfort layer made of Bio-Pur foam, which is simultaneously pressure-relieving and responsive. Sleepers sink into this foam layer a fair amount and enjoy some body contouring, but they shouldn’t feel stuck in the mattress. To see how it compares to other responsive all-foam mattresses, read our Amerisleep vs. Tuft & Needle review and Amerisleep vs. Puffy review. Also, read our Amerisleep vs. GhostBed comparison to see how it stacks up against a bouncier mattress.

Average Weight Sleepers – 130 lbs – 230 lbs

Most average-weight back sleepers should enjoy a great balance of comfort and support on the Amerisleep AS3. (Folks who are on the heavier side of the weight spectrum might prefer the firmer AS2.) Similarly, most average-weight side sleepers should enjoy plenty of pressure reliefbut folks who weigh closer to 230 pounds might want to look at the softer AS4 or AS5. The Amerisleep AS3 is likely too soft for average-weight stomach sleepers.

Heavyweight Sleepers – Over 230 lbs

Heavyweight sleepers who weigh close to 230 pounds should enjoy spinal support as well as pressure relief on the Amerisleep AS3. Folks who weigh more than that will probably want to look for a more supportive mattress for heavy people. Heavyweight side sleepers will probably prefer the Amerisleep AS4 or AS5, both of which offer thicker comfort layers that are more likely to provide adequate pressure relief. The Amerisleep AS3 is too soft for heavyweight stomach sleepers.

Lightweight Sleepers – Under 130 lbs

The Amerisleep AS3 is a great option for lightweight back sleepers, who should enjoy a pleasant balance of body contouring and spinal support. It’s also a great option for lightweight side sleepers, who should find plenty of pressure relief on this mattress. As with average- and heavy-weight sleepers, the Amerisleep AS3 is probably too soft for lightweight stomach sleepers.

30% Off
Amerisleep AS3
Amerisleep AS3
Amerisleep AS3

The Amerisleep AS3 is the brand's most popular model and offers an excellent balance of comfort and support. Get 30% off the Amerisleep AS3 mattress by using code AS30

Amerisleep AS3 Mattress Construction

Now that you have a sense of what it’s like to sleep on top of the Amerisleep AS3, let’s take a peek under its hood (or, er, cover)! We’ll assess each layer of this mattress’s construction and reveal how different materials influence performance.


The Amerisleep AS3 has a thin, breathable cover that allows for some air flow through the surface of the mattress.

Comfort Layers

The Amerisleep AS3’s primary comfort layer consists of 3” of plant-based and open-celled Bio-Pur foam, which is simultaneously pressure-relieving and responsive. The Bio-Pur foam is also CertiPUR-US certified, which means it’s eco-friendlier than some foams and is low in volatile organic compounds (VOCs).

Amerisleep AS3 - construction and foam layers

Underneath the Bio-Pur layer, there’s a 2” HIVE Transition layer. This layer is zoned to create subtle differences in firmness across the mattress. It’s a touch softer around the shoulder and hips (for pressure relief) and a touch firmer around the head, back, and legs (for extra support).

Support Layer

The base layer on the Amerisleep AS3 is composed of 7” of a dense Bio-Core foam, which provides overall structure and support for the mattress. This is a durable layer, and the brand claims it won’t sag or develop soft spots over time.

Mattress Height

The Amerisleep AS3 is 12” tall.

RELATED: Amerisleep vs. Bear 

Amerisleep AS3 Mattress Size Options and Price

To see the most up-to-date size and pricing info for the Amerisleep AS3 mattress, check out the charts below!

Size Dimensions Price
Twin 38″ x 74″ x 12″ $1149
Twin XL 38″ x 80″ x 12″ $1199
Full 54″ x 75″ x 12″ $1349
Queen 60″ x 80″ x 12″ $1499
King 76″ x 80″ x 12″ $1899
California King 72″ x 84″ x 12″ $1899
Split King 38″ x 80″ x 12″ (x2) $2398

Amerisleep AS3 Mattress Performance

Alright, so we’ve looked at the Amerisleep AS3’s firmness, feel, and construction. Let’s finish off this review with a look at some final key performance metrics. We put the Amerisleep AS3 through a range of tests to assess its performance with regard to temperature regulation, motion transfer, edge support, and more. To see how it compares to other brands, check out our Amerisleep mattress comparisons.

Sleeping Hot Or Cold

The Amerisleep AS3’s breathable cover and open-celled Bio-Pur foam make this mattress more breathable than many all-foam beds. That said, it’s still an all-foam mattress, so it could trap some heat.

Motion Transfer

While the Amerisleep AS3 is fairly responsive, it still does a great job of handling motion transfer. The Bio-Pur foam isolates motion to one side of the mattress, so partners shouldn’t disturb each other when moving around during the night. This could make this a great mattress for couples.

Edge Support

We found the edge support on the Amerisleep AS3 to be decent but not phenomenal. The edges do collapse a bit when we sit or lie down near the edge. Folks who need to prioritize edge support might want to consider the firmer AS1 or AS2.

Amerisleep Mattress - Edge Support


This is a very durable mattress, which is reflected in its longer-than-usual warranty.


We did observe some off-gassing from the Amerisleep AS3. This should dissipate within a few days.


This is not a noisy mattress at all, probably in part because of its all-foam construction. Folks who are wary of noisy beds should be happy with this mattress.


When people look for a mattress for sex, they’re usually concerned with how easy it is to move around. Because the Amerisleep AS3 is fairly responsive, it should be a decent match. Partners shouldn’t feel stuck in this mattress.

Overall Rating

Amerisleep AS3 Mattress
3.9 Overall
Edge Support
Motion Transfer
Trial Period

Amerisleep Company Policies

Before you purchase the AS3, you probably want to feel confident that you understand all of the important policies attached to it. If that’s the case, take a look at the sections below where we will break down the Amerisleep mattress warranty, sleep trial period, and return policy.


The Amerisleep AS3 mattress comes with an extra-long 20-year limited warranty. If you don’t know what a warranty is, you can learn more in our mattress warranty guide that explains the basics.

With your 20-year limited warranty, Amerisleep will cover the cost of repairs or replace your mattress if there are any manufacturing defects as laid out in the terms. The first 10 years are a full replacement warranty meaning repairs and replacements are free-of-charge. During the second 10 years, Amerisleep will only cover a portion of the costs for repairs or replacements.

Sleep Trial

Amerisleep offers a 100-night sleep trial period for the AS3 mattress, meaning you get 100 nights to test out your mattress in your own home and decide if it’s a good match for you.

Return Policy

If you decide that you don’t like the AS3 mattress, you can return it during the 100-night trial period for a full refund. Amerisleep requests that customers wait at least 30 days before starting the return process so you allow enough time to really test out the mattress, break it in, and adjust to the “new mattress feel.”

How Does The Amerisleep AS3 Compare To Other Mattresses?

We’ll compare the Amerisleep AS3 mattress to two other popular mattresses, the Nectar and Purple, so you can see how it compares to some of the other mattresses you may be considering.

Amerisleep AS3 Vs Nectar

If you’re searching for one of the best memory foam mattresses you can buy online, you’ve probably come across both the Amerisleep AS3 and Nectar mattresses. These mattresses have many things in common, and a few factors that set them apart.

First, the AS3 and Nectar mattresses are both all-foam mattresses that offer all the great qualities we look for in a memory foam mattress including responsiveness, pressure relief, and the ability to regulate your body temperature and keep you cool while you sleep. When it comes to cooling, the AS3 should sleep a little cooler than the Nectar mattress.

Nectar Mattress - Construction And Foam Layers
Nectar mattress construction

These two mattresses are also both a good choice for couples because they do a good job of isolating motion–meaning you won’t feel your partner’s movements on the other side of the bed as much. Additionally, the Nectar and AS3 mattresses are offered around the same price point.

One difference between the AS3 and Nectar mattress that shoppers may be concerned about is the slow-moving memory foam feel. The Nectar has a nice, slow-moving memory foam feel that some people are looking for, so it may feel softer than the AS3. The AS3 has more of a balanced foam feel–meaning it will feel more supportive.

Who Should Get The Amerisleep AS3? 

  • People looking for a balanced foam feel of comfort and support
  • People looking for a memory foam mattress that keeps you cool

Who Should Get The Nectar? 

  • People looking for a soft, slow-moving memory foam feel
  • Those on a tighter budget (the Nectar is slightly more affordable)

Read our full Amerisleep vs Nectar comparison to learn more.

Amerisleep AS3 Vs Purple

Next, we’ll compare the AS3 to the Purple mattress. Different from the AS3 and Nectar, the Purple has a unique hyper-elastic gel polymer material construction.

This results in the AS3 and Purple mattress having very different feels. Both mattresses have a medium-firm feel, but the Purple has a more bouncy and responsive feel. Compared to the Purple, the AS3 feels more like a traditionally slow-moving memory foam mattress.

Because of its grid-like construction, the Purple mattress also sleeps cooler than the AS3. Plus, the Purple is more affordable than the AS3 mattress. Both mattresses offer nice support and long-term durability; it really just comes down to choosing which feel you prefer.

Who Should Get The Amerisleep AS3? 

  • People who like the traditional memory foam feel (but with more support)

Who Should Get The Purple? 

  • People who like the unique, bouncy, responsive feel of the mattress
  • People who care a lot about sleeping cool
  • People on a tighter budget
  • Heavier people who don’t want to sink into their mattress

Read our full Amerisleep vs Purple comparison to learn more.


Can you flip the Amerisleep AS3 mattress?

You do not need to flip the Amerisleep AS3 mattress. The side with the white fabric cover should be facing upwards.

Why can I buy the Amerisleep AS3 mattress?

Amerisleep sells their mattresses online. You can visit to purchase one of their mattresses. They currently do not sell their mattresses through any other retailers or store-front locations.

How long does the Amerisleep AS3 mattress last?

The Amerisleep AS3 mattress should last around seven to 10 years with proper care and use.

Marten is Senior Editor at Mattress Clarity. He covers the mattress industry as well as sleep science news. He is specifically interested in the connection between sleep and overall health. Marten has written for media publications like Consequence of Sound and received a master’s degree in Film Studies from Emory University. He comes from Franklin, Indiana, and spends all the time he can writing, directing, and acting in films. He has directed genre short films and features. His newest film, Starlets, recently premiered at the River Town Film Festival in Clinton, NJ. He also stars in the upcoming thriller, Sour Bear. His next film, At The Hop, is a hot rod actioner with a horror twist.