Amerisleep AS3 Mattress Reviews (2026)

In our tests, the AS3 balanced contouring and support better than many memory-foam beds. On my side and back, it cushioned pressure points without letting my midsection sink too deeply, and it kept partner movement contained. The trade-offs were a less buoyant feel and edges that compressed more when sitting or sprawling near the perimeter.

• Who It’s For

  • Side sleepers who want strong pressure relief without an ultra-soft top

  • Couples who prioritize low motion transfer

  • Back sleepers who like medium comfort with zoned support

• Who It’s Not For

  • Dedicated stomach sleepers who need a firmer, flatter plane

  • People who want a bouncy, spring-forward surface

  • Anyone who sits on the edge often and expects coil-like stability

We used our standard mattress testing process on the AS3, then ran repeatable checks for support, cooling, pressure relief, motion isolation, responsiveness, edge support, and durability. In our testing, we compared back and side alignment, watched for pressure buildup during longer holds, and noted how quickly the foam released when changing position. We also ran partner-movement and drop tests for motion transfer, plus sitting and near-edge sleep checks to see where support began to taper off.

The cover felt cool at first touch, then the surface settled slowly into a more molded than plush feel. On my back, the mattress kept my lower back supported without leaving a hollow gap. On my side, it gave my shoulder enough room to sink without throwing off neck alignment. Marcus, who rotates between stomach and back sleeping, liked the support under his hips at first but still noticed some drop when he rolled onto his stomach. Jenna and Ethan both commented on the low motion transfer, though Ethan still noticed a little foam drag during quick position changes.

• What we liked

  • Comfortable medium balance for mixed side/back nights

  • Very low partner disturbance on routine toss-and-turn evenings

  • A calm surface that doesn’t feel jittery or overly buoyant

• Who it is best for

  • Side sleepers and back sleepers in the average-weight range

  • Couples who wake easily from movement

  • People who want contouring without a very soft top

• Where it falls short

  • Dedicated stomach sleepers who need a firmer, flatter feel at the hips

  • Shoppers who want stronger edge sitting support

  • Anyone who dislikes slower foam response during turns

• Mattress type: All-foam memory-foam mattress

• Feel: Medium

• Height: 12 inches

• Key materials: Bio-Pur comfort layer, HIVE zoned transition layer, and Bio-Core base foam

• Zoned design: HIVE is described by the brand as a five-zone support system

• Cover: Refresh Cover with a cool-to-the-touch, cooling-focused surface; the brand also describes it as removable and washable

• Fiberglass-free: Yes, according to the brand

• Available sizes: Twin, Twin XL, Full, Queen, King, Cal King, and Split King

• Shipping: Free shipping and returns in the continental U.S.; compressed and shipped via FedEx as a mattress in a box, usually arriving in two weeks or less

• Trial: 100-night sleep trial

• Returns: Free pickup is coordinated for returns

• Warranty: 20 years, with full replacement coverage for the first 10 years and prorated coverage for the second 10 years

• Manufacturing note: Made in the USA of U.S. and imported components; covers sewn in Canada

• Price: At the time of our latest check, starting at $999, with a listed pre-discount price of $1,499 on the same product page

Pick the AS3 if you want a medium feel with contouring, care most about pressure relief, and value low motion isolation more than bounce. It performed best for side and back sleepers in our tests, and it makes sense for couples who wake easily. The main compromises are edge stability and slower movement across the surface.

If you want a similar medium profile with more lift and easier movement, the Helix Midnight is the more buoyant option. If you want a more traditional spring setup and simpler mobility, the Saatva Classic is the better fit.

This mattress can feel slightly too forgiving under the hips for dedicated stomach sleeping, especially for sleepers whose body weight makes them more sensitive to lower-back sway. The edge is serviceable for sleeping but not great for frequent sitting. And while the top feels cooler at bedtime, longer still positions can still run warm the way many foams do, so very hot sleepers may want something breezier. If you want a fast, bouncy surface that makes turning effortless, this isn’t that style of bed.

• Why choose this model

  • You want medium contouring without going ultra-soft

  • You share a bed and need low motion transfer

  • You prefer a quieter foam feel over spring bounce

• Alternatives to consider

  • Helix Midnight if you want a medium hybrid feel with more buoyancy

  • Saatva Classic if you want a more traditional spring feel and easier mobility

• Give it a short break-in window before you lock in your opinion on firmness

• Use a breathable protector if you want to preserve more of the cover’s cool feel

• If you sleep warm, pair it with lighter bedding and more breathable sheets

• Rotate it head to foot from time to time to support more even long-term wear

• If you’re a stomach sleeper, test it with a thinner pillow to keep your spine in a better sleeping position

• For couples, run a quick get-in/get-out drill early in the trial to confirm that the motion control works for your routines

• Put it on a supportive platform or foundation so the foam layers can work evenly