Starting at $1449  $1249
Available in 7 sizes
AS4 Memory Foam Mattress Bedroom
AS4 Memory Foam Mattress on Mattress Foundation
AS4 Memory Foam Mattress
AS4 Memory Foam Mattress Tag
MEDIUM SOFT FEEL Profile height: 12-inch

Risk-free, 100-night trial

20-year warranty

Free shipping & returns

Made in USA


Why you'll love it

Experience cloud-like comfort with the medium-soft AS4. Designed with a deeper top layer of pressure-relieving foam, our AS4 offers extra cushion for side and combo sleepers.

  • Plant-based Bio-Pur® memory foam is cooling, responsive, and pressure-relieving
  • HIVE® technology provides zoned comfort and support, creating a weightless feel
  • Durable Bio-Core® reinforces the layers above to keep you comfy all night long
  • Free, no contact fast shipping
  • 100-night, risk-free sleep trial
  • Easy and free returns
  • 20-year warranty
  • Made in the USA
  • Twin (38" x 74") $1449
  • Twin XL (38" x 80") $1499
  • Full (54" x 75") $1649
  • King (76" x 80") $2099
  • Queen (60" x 80") $1799
  • California King (72" x 84") $2099
  • Split King (38" x 80" - 2) $2998
Amerisleep foundation
Amerisleep Foundation

Perfectly support your mattress

+ $275
$1799 $1599 with promo
save $200.00
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Better sleep through better design

Sleep Cooler

Sleep Cooler

Comfort You Will Love

Comfort You Will Love

Tested to Last

Designed to Enhance Sleep

More Support, Deeper Sleep

Alleviates Pressure Points

Eco-Friendly Production

Eco-Friendly Production

Stays cool all night

Our plant-based Bio-Pur® material keeps you cool all night. It features an open-cell design that allows more air to escape than traditional foam.

Moon icon

Open-cell design wicks away warm air

Wind icon

More breathable than traditional foam

Experience Bio-Pur®:
Eco-Friendly, Cooler Memory Foam

Bio-Pur® is the perfect answer to a better bed. Available in every Amerisleep mattress, we engineered Bio-Pur® to deliver cooling comfort, responsive support, and healthier sleep.

Memory foam lovers say Bio-Pur® is a huge upgrade, while critics admit it solves all the problems of traditional memory foam. Plus, since our beginnings in 2009, we've proudly manufactured Bio-Pur® in the USA.

Bio-Pur® vs Traditional Memory Foam

Breathable & Cooling

Bio-Pur®'s large, open-cell structure has a few distinct advantages:

  • Allows air to flow freely
  • Prevents heat build-up
  • Perfect for hot sleepers

Responsive & Supportive

Unlike traditional memory foam, Bio-Pur® has a rapid response time that:

  • Relieves painful pressure points
  • Prevents heat build-up
  • Bounces back in just seconds

Eco-Friendly Materials

Featuring renewable plant-based oils, Bio-Pur® helps us:

  • Minimize use of non-renewable resources
  • Prevents heat build-up
  • Produce products that are better for you and the planet

A Healthier Sleep

The surface you sleep on is important. That’s why Bio-Pur® is:

  • CertiPUR-US® certified & low in VOCs
  • Resistant to dust mites, mold, and mildew & made without harsh chemicals

Traditional memory foams miss the mark when it comes to cooling and responsiveness. Amerisleep’s proprietary Bio-Pur® memory foam is an eco-friendly alternative that blends contouring comfort with buoyant support and superior breathability to help you get your best night’s sleep yet.

Our plant-based Bio-Pur® is significantly more breathable and responsive than traditional memory foam. It snaps back to its original shape in seconds, so it’ll never cause you to uncomfortably sink, and it’s significantly more porous and airy, so you won’t have to worry about night sweats. Even better? Bio-Pur® contains a fraction of the petrochemicals used in other memory foams, so it’s less likely to off-gas and is completely free of harmful substances.

That’s why in over 15,000 reviews, our mattresses rate 4.7 out of 5 stars and why 98% of customers would recommend us to a friend.

See why our customers love Bio-Pur®

  • All
  • Breathable
  • Comfortable
  • Responsive
  • Supportive

Relieves pain & pressure points

Our Bio-Pur® comfort layer contours to your body and relieves pain-causing pressure points. But it also bounces back fast, so you never feel “stuck” if you move around at night.

Zoned comfort icon

Soothing pressure point relief

Pressure point icon

More responsive than traditional foam

Crafted for lasting comfort

We make our mattresses here in America with the highest quality craftsmanship. They’re built to last and backed by a two-decade warranty.

Warranty icon

Industry-leading 20-year warranty

Support icon

Won’t sag or develop soft spots

Made with side sleepers in mind

Our medium-soft mattress offers plush comfort with targeted support that helps you sleep your best.

Amerisleep AS4 mattress cover Amerisleep AS4 mattress layers
Ultra-Breathable Comfort

Our soft and ultra-breathable covers help prevent overheating, so you can sleep your best each night.

Stays Cool & Never Feels “Stuck”

Bio-Pur®’s open-cell design keeps you cooler than traditional foam. It also contours to your body to relieve pressure points and bounces back fast, so you won’t feel “stuck”.

Targeted Pressure-Relief System

Our HIVE® transition layer provides targeted support and pressure relief so you can sleep in perfect alignment. It gives your head, back, and legs more support, and your shoulders and hips more cushion.

Durable Support for Decades

The Bio-Core® base layer gives you durable support that lasts for decades. It won’t sag or develop soft spots over time. (And we prove it with our 20-year warranty.)

Sleep in perfect alignment

Our HIVE® transition layer gives your body targeted support to ease tension and help you sleep in perfect alignment. It provides added support under your head, back, and legs. And it gives your shoulders and hips extra cushion. We’ve also designed HIVE® to reduce pain-causing pressure points.

Enjoy deeper sleep and more daily energy. Try the AS4 for 100 nights.
100 Night Trial
Risk-free, 100-night trial
with free shipping & returns


Available sizes
  • Twin 38" W x 74" L x 12" H
  • Twin XL 38" W x 80" L x 12" H
  • Full 54" W x 75" L x 12" H
  • Queen 60" W x 80" L x 12" H
  • King 76" W x 80" L x 12" H
  • Cal King 72" W x 84" L x 12" H
  • Split King 38" W x 80" L x 12" H (x2)
Free Shipping

Amerisleep mattresses come with fast and free shipping within the continental US. We ship our mattresses compressed in an eco-friendly box using FedEx. And in most cases they arrive in a week or less.

20-Year Warranty

Amerisleep mattresses are backed by an industry-leading 20-year warranty. For the first 10 years, we will replace your mattress if you encounter any defects, including sagging greater than 0.75”. And for the second 10 years, we will offer you a prorated replacement.


Our mattresses are compatible with a variety of bed frames and bases.

Mattress Foundations
Our memory foam and hybrid mattresses are best supported on solid or slatted mattress foundations. Slatted bases should have slats no more than 3 inches apart — we even sell our Amerisleep Mattress Foundation designed to pair perfectly with our mattresses.

Platform Beds
Platform beds have a solid or slatted base, so they can provide proper support for our mattresses. If you have a platform bed with large gaps between slats, we suggest buying extra slats or a bunkie board to create a sturdier surface for your mattress and meet warranty guidelines.

Adjustable Bed Frames
Both our memory foam and hybrid mattresses work well with adjustable bed frames. They’re adaptable and flexible, so they can move with the base without becoming damaged or worn. We even sell two adjustable bed frames to pair with our beds: the Amerisleep Adjustable Bed and the Amerisleep Adjustable Bed+.

The Floor
If you don’t have a bed frame or foundation at home, or don’t care to buy one, you do have the option to place one of our mattresses directly on the floor. The floor will provide even support for your bed, but it’s good to remember that keeping your mattress directly on the floor means it’s likely to accumulate dust, dirt, and allergens a lot faster than if it were raised up off the ground. Plus, the risk of heat and moisture retention is higher when you place your mattress on the ground, as the solid ground doesn’t allow for much airflow beneath the bed. With that, we don’t recommend placing your Amerisleep mattress directly on the floor, but it can technically be done.

While our mattresses can work with most bed frames and foundations (or be set directly on the floor), it’s not compatible with absolutely every type of mattress support — namely box springs.

Box Springs
Box springs are best paired with innerspring mattresses, and since innerspring beds were the most common for many years, a lot of us have box springs at home. Box springs contain coils within and as a result, are bouncy. Beds with foam layers can experience premature wear, tear, and unexpected damage when paired with one of these because they do not offer the even, sturdy support foam beds need.

Upgrade your mattress with our complete sleep system

Amerisleep pillow
Go ahead and relax

Shop our lineup of pillows engineered for better head and neck support.

Browse Pillows
Amerisleep bedding
Wrap yourself in luxury

Explore our suite of bedding options designed for exceptional softness and comfort.

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See what our satisfied sleepers have to say

All reviews are unaltered and verified by a 3rd party.


All featured customer reviews are unaltered and verified by a third-party. The comments made by customers are not intended as advertisements, and should be understood as the perspective of each individual based on their experience. These reviews should not be construed to mean that these experiences are universal or that results will always be the same.

Frequently asked questions

What does the Amerisleep AS4 feel like?

The AS4 contours to your whole body and has extra cushion for your hips and shoulders.

Do I have to flip or rotate my mattress?

No, we use durable materials designed to last for decades. They won’t sag or develop soft spots, and the ultra-breathable white should always face upward.

What kind of bed sheets should I use with my mattress?

Thick sheets can trap heat and reduce the breathability of our mattresses. We recommend you pair your Amerisleep mattress with our luxurious and breathable bedding.

Where can I try the Amerisleep AS4?

The best place to try a new mattress is in your own home. That’s why we offer a risk-free, 100-night trial. It lets you experience the best your mattress has to offer, and if you don’t love it we’ll give you a full refund.

But if you do want to try the Amerisleep AS4 in person, you can visit one of our retail locations. (You’re still covered by the 100-night trial, even if you order in one of our stores.)

Can this mattress be used on an adjustable bed base?

It sure can! Both our memory foam and hybrid mattresses are flexible and adaptable enough to pair with these sleep-enhancing frames. You won’t have to worry about wearing down the foam or coils as the bed adjusts, as our mattresses are crafted with high-quality materials to resist this type of damage.

If you’re interested in an adjustable base to go with your new mattress, check out our two models: the entry-level Adjustable Bed and the more luxurious Adjustable Bed+.

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