Is the AS3 good for side sleepers?

The medium feel cushions pressure points, and many side sleepers find it comfortable. Lighter side sleepers may want a softer feel.

The Bio-Pur foam and Refresh cooling cover are designed to reduce heat buildup. Most owners say it sleeps cooler than typical memory foam, though very hot sleepers may still notice warmth.

Does it contain fiberglass?

No. Amerisleep builds the AS3 without fiberglass, and the materials are OEKO-TEX and CertiPUR-US certified.

Do I need a box spring or foundation?

A foundation or adjustable base is not included. The mattress works on a flat foundation, platform bed or adjustable base.

How does it compare with the AS2 or AS5?

The AS3 is the middle medium feel. The AS2 is softer and the AS5 firmer, so the AS3 suits shoppers who want one bed for mixed sleep positions.

Yes. It is hypoallergenic and fiberglass-free, and the medium feel works for children as well as adults.

What do buyers say about the Amerisleep AS3 Medium Memory Foam Mattress?

Rated 4.7 out of 5 from 8,300 ratings. Buyers like: Sleeps cool and breathable; Comfortable yet supportive; Relieves pressure points and back pain.

Amerisleep AS3 Medium Memory Foam Mattress Price History: 33% Off

Q: Where is the Amerisleep AS3 Medium Memory Foam Mattress cheapest?

At Amerisleep, for $999.00, 33% off, as of our latest check.

What reviewers say

4.7 / 58,300 ratings

With 4.7 out of 5 from over 8,300 ratings, owners largely praise the AS3's comfort, cooling and lack of fiberglass. Complaints center on firmness not matching expectations and warmth for some sleepers.

What people mention

FirmnessMixedSome owners find the medium feel firmer or softer than they expected.
CoolingPraisedMany say it sleeps cooler than other memory foam beds, though a few hot sleepers still notice warmth.
FiberglassPraisedBuyers value that it is fiberglass-free and has little odor on arrival.
ComfortPraisedMost reviewers report comfortable support across back and side sleeping.
Edge supportCriticisedSome note the edges give more than on coil or hybrid mattresses.

From Amerisleep

Best-selling medium-feel mattress tailored to most body types and sleep styles
Plant-based Bio-Pur® memory foam for cooling comfort
HIVE® technology for airflow and targeted support
Fiberglass-free, eco-friendly and non-toxic construction
Refresh Cover stays on average 7 degrees cooler than a traditional 100% polyester cover
Voted #1 Best Mattress 2026 in Newsweek Readers' Choice Awards; endorsed by the American Chiropractic Association

Sizes: Twin, Twin XL, Full, Queen, King, Cal King, Split King
Materials: Plant-based Bio-Pur® memory foam; Refresh Cover knitted with minerals; CertiPUR-US® certified, low in VOCs, fiberglass-free
Fit: Medium feel; 12-inch profile; designed for all sleep styles
Sizing: Medium feel suited to most body types and all sleep styles; available in Twin through Split King.
Care: Use a waterproof mattress protector; rotate head to foot every six months; removable and washable cover
Guarantee: 20-year warranty: full replacement for defects such as sagging over 1.5 inches in the first 10 years, prorated replacement in the second 10 years.
Returns: 365-night risk-free sleep trial with free returns; full refund if not satisfied after the first 30 nights, courier pickup arranged.
Shipping: Free shipping within the continental US via FedEx; most orders arrive in two weeks or less; accessories may ship separately.
Packs: All-foam AS3 and hybrid AS3h (foam + coils) options
In the box: Mattress compressed and shipped in an eco-friendly box

About the Amerisleep AS3 Medium Memory Foam Mattress

The Amerisleep AS3 is a medium-feel memory foam mattress that ships in a box. It uses plant-based Bio-Pur memory foam over a Bio-Core base layer. The foam is hypoallergenic.

The Refresh Cooling Cover is meant to keep hot sleepers cool. The mattress is fiberglass-free and non-toxic. Its materials are OEKO-TEX certified and CertiPUR-US certified.

It suits all sleep positions and most body types, and it is made for everyday use by both kids and adults.