Amerisleep AS3 Mattress Review

Amerisleep’s most popular mattress is the AS3. It is a memory foam mattress in the “Goldilocks zone” between firm and soft, making it ideal for all sleep positions. Thanks to some clever innovations by Amerisleep, the AS3 excels at pressure relief and cooling comfort. Its 20-year warranty is one of the best in the industry, and its comfort quality is akin to other well-reviewed luxury brands like Saatva, but at a much more affordable price point.

In our Amerisleep AS3 review, we’re going to walk you through the highlights of this mattress, including pros and cons, materials, and accessories. We’ll also help you decide if the AS3 is right for your unique sleep style.

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Pros and Cons of the Amerisleep AS3 Mattress

Amerisleep AS3 is for you if: Amerisleep AS3 isn't for you if:
You want great value: The Amerisleep AS3 is a fairly affordable mattress with custom-designed foam layers made from high-quality materials. The AS3 is a high-end bed at the price of a standard mattress. You want a customizable mattress: Besides selecting a mattress size, you are not able to alter any aspects of the AS3, such as its firmness or the width of its comfort layer.
You need support for all sleep positions: The balance of contour support and responsiveness makes the AS3 a great choice for any sleep style. Its plush memory foam and HIVE® comfort layer work in tandem to provide spinal support and pressure relief in any position. You don't need the firmest bed: The AS3 rates medium-firm on the mattress firmness scale, meaning it might feel a little bit hard to those expecting to sink into super-soft foam. This affects lightweight sleepers especially.
You want an industry-topping warranty: Sleep easy with Amerisleep’s 20-year warranty. It’s twice as long as most other foam mattress brands. Plus, it tells you that Amerisleep stands behind its materials and construction.  
You want to sleep cool: The AS3 takes multiple approaches to combat heat retention—a common issue for foam mattresses. The result is a remarkably cooler night’s sleep.  

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The Amerisleep AS3 Mattress - An Overview

AS3 Mattress

  • Material: Memory Foam
  • Firmness: Medium-Firm
  • MA Score: 8.4/10
  • Customer Rating: 4.7/5
  • Trial Period: 100 nights
  • Warranty: 20-year
  • Price: $$
  • Mattress Height: 12”
  • Sizes/Dimensions:
Size Dimensions (L x W)
Twin 38” x 74”
Twin XL 38” x 80”
Full 54” x 75”
Queen 60” x 80”
King 76” x 80”
Cal King 72” x 84"
Split King 38” x 80” (x2)

MA Score: The Mattress Advisor Score is a weighted score that takes into account 14 different factors related to the mattress’ performance, function, convenience and the brand’s social responsibility.

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Amerisleep AS3 Mattress Materials

Layers of the Amerisleep AS3 mattress

The Amerisleep AS3 mattress is an all-foam mattress consisting of three foam layers and a cooling mattress cover. Amerisleep manufactures its own foam that is low in VOCs (volatile organic compounds) and CertiPUR-US certified. Its layers are exclusive to Amerisleep products.

What’s Inside?

  1. High-density base foam: 7” of high-density poly foam forms the base layer of the AS3. This layer provides deep compression support to your body and gives the mattress a durable foundation.
  2. The HIVE® channeled poly foam: The HIVE® transition layer is made of 2” of medium-density poly foam. This layer varies in firmness from top to bottom to offer targeted support for optimal spinal alignment. 
  3. Bio-Pur® memory foam: The top layer of the AS3 is made from 3” of memory foam. The high-quality Bio-Pur® foam features an open-cell structure for optimal airflow as well as plush, contouring comfort.
  4. Mattress cover: The stretchy cover helps to diffuse heat. It is Greenguard certified to meet fire safety standards.

Amerisleep AS3 Mattress Features

Pressure Relief

Pressure relief refers to a mattress’s ability to relieve pressure points in your joints and muscles as you sleep. Aggravated pressure points can cause aches and pains. When you sleep, you want to be fully supported so the tension in your body melts away.

The AS3 provides advanced pressure relief thanks to its contouring support. Its exclusive Bio-Pur® comfort layer hugs the body, supporting the back, neck, hips, and shoulders. This keeps the spine aligned during sleep and prevents pressure that causes pain in the lower back, neck, and joints.

The foam comfort layer is reinforced by a responsive support layer specially developed by Amerisleep. Called the HIVE®, this transition layer provides targeted support to different areas of the body. This means that the HIVE® has different firmness levels from top to bottom to correspond to the position of your head, torso, and legs. The support and responsiveness added by this layer ensure you sleep in perfect alignment. It’s also one of the reasons the AS3 is a great choice if you’re looking for the best mattress for back pain.

Motion Isolation

Good motion isolation is a must for light sleepers who share a bed. High motion isolation guarantees that if you toss and turn or change positions at night, your partner won’t be disturbed.

The best memory foam mattresses typically isolate motion well, as they don’t contain any bouncy springs. While the AS3 is a bit firmer and more responsive than other memory foam mattresses, it still isolates motion very well. Average-to-light sleepers will not be woken up when their partner gets into or out of bed.

But, the AS3 may transfer some motion. Its Bio-Pur® memory foam is designed to be more responsive (this means it adapts to your movements more quickly). This makes it easier to change positions while sleeping and prevents that “sinking in” feeling of other foam mattresses. But, it also transfers some motion. If you’re a very light sleeper whose partner moves a lot at night, you might want to choose another mattress.

Edge Support

The contouring support of memory foam is great for pressure relief and support when you’re lying in the middle of a mattress, but it can sag and lose its supportive benefits at the edges. This is why foam mattresses are often reinforced at their edges.

The Amerisleep AS3 performs better than most foam mattresses when it comes to edge support (though it doesn’t contain additional materials that bolster the edges). Average-sized stomach sleepers and side sleepers who hang out on the edges of the mattress will enjoy adequate contour support. You can also sit on the edge without feeling like you’re sliding off.

Large sleepers may want to opt for the hybrid mattress alternative to the AS3, the AS3h (more on the AS3h later), a version of the AS3 with an innerspring layer.

Read more about the best mattress for heavy people.

Temperature Control

One of the most impressive features of the AS3 is its ability to regulate your body temperature and help you stay cool at night.

One of the biggest complaints about memory foam is that it sleeps hot. Amerisleep took a 3-pronged approach to solve this problem.

  • Open-cell Bio-Pur® foam: The AS3’s comfort later is made of foam with an open-cell structure that allows air to flow freely through it.
  • Channeled HIVE® support foam: The transition layer is channeled to promoted airflow.
  • Cooling mattress cover: The AS3’s mattress cover is made of celliant, a mineral-based material that absorbs body heat and turns it into infrared energy.

Amerisleep’s use of high-quality materials and custom-designed layers makes it one of the best memory foam mattresses for hot sleepers.

Low Off-Gassing

Memory foam beds made from synthetic foam will often off-gas, or discharge a chemical odor that lingers around the mattress for a few days after it’s been decompressed. This odor is harmless and only lasts from a few hours to a few days, but it can be unpleasant.

The foam used in the AS3 is made from plant-based material—not synthetic poly foam. Because of this, the AS3 has little to no off-gassing odor.

Learn more about how to reduce allergens with our top-reviewed best latex mattresses.

Good Warranty

All-foam mattresses are expected to last around 8-10 years, and most mattress brands offer their buyers a 10-year warranty. Amerisleep goes above and beyond, offering a 20-year warranty on the AS3.

The warranty covers manufacturer defects and guarantees a free replacement or repair within the first 10 years. From years 11-20, Amerisleep provides a prorated replacement (prorated means you pay a lower price for replacement—Amerisleep offers a replacement at 50% of your original purchase price).

This industry-topping warranty says a lot about the quality of materials and durability of this Amerisleep mattress.

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Compatible Foundations

Mattress Platform/Foundation

The AS3 was designed to be supported by a completely flat, solid wood foundation or platform. Using a platform made of metal bars or springs will void the warranty. Luckily, you can purchase a compatible bed foundation from Amerisleep. It has the added benefit of matching the AS3 perfectly in style and size.

Box Spring

You can support the AS3 with a box spring, but it must be covered by a moisture-resistant piece of plywood that is at least 0.75” thick. If you use any box spring that doesn’t meet these requirements, your warranty will be voided.

Slatted Base

A slatted base is an affordable option for supporting the AS3, but its slats must not be more than 3” apart or you’ll risk the validity of your warranty.

Adjustable Bed

The AS3 is the best mattress for adjustable beds, compatible with adjustable bed frames. It is even offered in a split king size for dual-sided adjustable frames. If you want an adjustable frame, we recommend buying the Amerisleep adjustable bed frame to get the most out of your mattress and warranty.

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Sleeping Positions Best for Amerisleep AS3

Side Sleepers

Side sleepers need extra cushioning and contour support to ensure proper spinal alignment. The AS3 is an excellent choice for side sleepers, as it combines plush comfort with just enough responsiveness to keep the spine aligned. Its 3” comfort layer offers medium-firm support that allows the body to achieve full body contouring (2” comfort layers can cause side-sleepers to contact the support layer below, resulting in aggravated pressure points). Though, the foam is responsive enough to prevent too much sinkage, which could cause a concave spinal bend. 

Extra support for the hips and shoulders (crucial for side sleepers) is provided by the HIVE® support layer below. Its targeted support system keeps the hips and torso suspended to keep the spine from arching.

Read more about the best mattress for side sleepers.

Back Sleepers

Back sleepers need a slightly firmer mattress to keep the shoulders and hips from sinking into the mattress and causing the spine to bend out of alignment. The AS3’s HIVE® transition layer targets the torso to ensure it receives extra support, keeping it level with the rest of the body.

The AS3’s responsive Bio-Pur® comfort layer prevents back sleepers from sinking into the mattress. This helps to prevent neck pain that can occur as a result of gradual misalignment of the neck and spine throughout the night.

Read more about the best mattress for back pain.

Stomach Sleepers

Stomach sleepers are some of the most pain-prone due to the position of their neck and hips. In the memory foam category, the AS3 might be the best mattress for stomach sleepers because of its responsive foam and added support for the hips.

Stomach sleepers often need to shift their weight, and the AS3 makes this easy thanks to its higher responsiveness. The HIVE® layer provides more support to the hips, preventing them from sinking in and bringing the spine out of alignment.

Stomach sleepers will still need to ensure that their neck isn’t elevated too much by their pillow, but the AS3 will take care of the rest, ensuring a pressure-free night’s sleep.

More About Amerisleep

Amerisleep’s top-notch customer support, online user experience, and risk-free sleep trial all make it easy to purchase this top-reviewed best mattress in a box. Here are some additional perks you can expect as an Amerisleep customer.

Free Delivery and Returns

Your Amerisleep AS3 ships for free and arrives at your door within 7-14 days (in the continental USA). If you aren’t satisfied, Amerisleep will cover the cost of return shipping, no questions asked.

100-Night Risk-Free Sleep Trial

Buying a mattress online can be stressful, but Amerisleep makes it easier with its 100-night sleep trial. When you purchase an AS3 mattress, you’ll have 100 nights to decide if it’s right for you.

Amerisleep recommends trying the AS3 for at least 30 days before requesting a return, but if you’re unsatisfied at any time during the first 100 days, Amerisleep will help you exchange your mattress for a different model or issue a full refund. Amerisleep will even pick up your mattress and recycle it for you at no cost.

Seamless Website

Buying a mattress online can be nerve-wracking, especially if you’re not tech-savvy. Luckily, Amerisleep’s website is easy to navigate, featuring clickable images and menus with large text.

Amerisleep’s online education center is full of guides, reviews, and video tutorials to help online mattress buyers understand how to choose the best mattress for their sleep style and home. There are even tutorials to help with mattress setup post-purchase.

Responsive Customer Support

Amerisleep customer support is available via email, phone, social media, and live chat. They respond quickly to customer inquiries with friendly and informed answers.

Eco-Friendly Materials

Amerisleep manufactures the AS3 with plant-based foams that are CertiPUR-US certified to meet emissions standards. Amerisleep goes further by making its foam with Variable Pressure Forming technology. This process does not use harsh chemicals and ensures that contaminants are not released into the air.

Amerisleep practices sustainable manufacturing and recycles or donates returned mattresses.

Made in the USA

All of Amerisleep’s mattresses, including the AS3, are manufactured in the USA.

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Other Mattresses Sold by Amerisleep 


AS1 Mattress

The AS1 is a firm mattress that consists of two foam layers. At just 10”, it’s a bit shorter than the AS3. It’s topped with 2” of Bio-Pur® memory foam and supported by 8” of high-density base foam. This model comes in at an 8/10 on the firmness scale, so it’s very firm and not recommended for side sleepers who need a bit more give.

Great for: 

  • Stomach sleepers
  • Back sleepers

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AS2 Mattress

The AS2 is a memory foam mattress that is almost identical to the AS3. The AS2 is specially formulated for back sleepers. The transition layer (the HIVE®) is one inch thicker than it is in the AS3, and the Bio-Pur® comfort layer is an inch thinner. The 12” mattress is a bit firmer than the AS3 thanks to the added reinforcement from the transition layer.

Great for:

  • Back sleepers
  • Large sleepers

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AS4 Mattress

The AS4 is Amerisleep’s medium-soft mattress. This AS4 is a 12” mattress topped with 4” of Bio-Pur® memory foam and a 1” HIVE® layer. This makes for a softer, cushioned feeling but sacrifices a bit of reinforcement. This is a mattress for those who love the classic memory foam feel but don’t want to sink down too deep. Find out more in our Amerisleep AS4 mattress review.

Great for:

  • Side Sleepers
  • Hot Sleepers
  • Lightweight sleepers

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AS5 Mattress

The softest mattress made by Amerisleep, the AS5 wraps you in a cloud of comfort thanks to its dual comfort layers. This 14” mattress is topped with 3” of Bio-Pur® foam and an additional 2” of compression foam. Below is a 2” HIVE® transition layer to support even heavy sleepers who like a soft mattress. The added compression foam also improves motion isolation.

Great for:

  • Side sleepers
  • Large Sleepers
  • Couples

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Other Sleep Accessories Sold by Amerisleep

Adjustable Base

Amerisleep's adjustable base

Comfort Classic Pillow

Amerisleep's Comfort Classic Pillow

Tencel Sheets

Amerisleep's tencel sheets

The Lift is Amerisleep’s version of a mattress topper. It is used to give your existing bed a “lift” if you aren’t ready to buy a whole new mattress. It is made from the same materials as their mattresses and comes in two firmness levels, comfort (softer) and support (firmer). Amerisleep pillows like the Comfort Classic one are made with Bio-Pur® memory foam. The open-cell foam makes for a breathable, supportive, and ultra-soft cushion for your head and neck. Amerisleep tencel sheets are soft and breathable to keep you comfortable all night. Made sustainably with eco-friendly materials.
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Amerisleep AS3 Mattress FAQ

  1. Can I finance my Amerisleep AS3 mattress?

    Unfortunately, Amerisleep doesn’t offer a financing payment plan.

  2. How long will it take for my Amerisleep AS3 mattress to be delivered?

    Your Amerisleep AS3 will ship within 3-5 business days and will be delivered within a week of shipping. You can expect your mattress to reach your door within 7-14 days of purchase.

  3. Can I flip my Amerisleep AS3 mattress?

    No. The Amerisleep AS3 is made of 3 different foam layers. The top layer is meant to cradle the body and the bottom layer is the mattress’s base.

  4. How long does it take for my Amerisleep AS3 to decompress?

    The Amerisleep AS3 should expand within 4-6 hours of unboxing. In some cases, it might take the mattress up to 24 hours to expand completely. 


The Amerisleep AS3 is the most popular mattress on the Amerisleep line. Its medium firmness, breathable materials, and extra support make it a great pick no matter your sleeping position.

You’ll love the Amerisleep AS3 if:

  • You suffer from aches and pains: Amerisleep developed its own unique foam layers to perfectly align the spine and eliminate neck, joint, and back pain, making it one of the best mattresses for back pain.
  • You love plush memory foam: Soft, plush Bio-Pur® foam hugs the body without too much sinkage.
  • You sleep hot: The AS3 is one of the best memory foam mattresses for temperature regulation.
  • You sleep with a partner: With low motion transfer and medium firmness, you and your partner will enjoy uninterrupted sleep even if you have different sleep styles.
  • You support sustainability: The AS3 is manufactured sustainably using plant-based foams that are good for the environment and all but eliminate off-gassing odors.

If you think the Amerisleep AS3 is right for you, why not try one for 100 days? There’s no risk to try thanks to free shipping and returns. Choose between 7 mattress sizes and add a matching base, pillows, and bedding to complete the set. And the best part? Amerisleep guarantees peaceful sleep and peace of mind with its 20-year warranty. Your dreams have never been sweeter.

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About the Author Benjamin Gorman

Benjamin is a sleep health specialist. He contributes to numerous sleep and wellness publications to promote positive sleep habits as well as sustainable mattress manufacturing and disposal.