Amerisleep AS3 Mattress Reviews (2026)

The AS3 All Foam is a strong choice if you want close contouring without the deep, slow sink of traditional memory foam. It gave the shoulder and hip enough room on my side, held the midsection steadily on my back, and kept movement on one side of the mattress from disturbing the other. Its 4.2/5 overall score reflects that balance. This is not the right bed for the springy response of a hybrid or firm edge sitting, but it is one of the more convincing medium all-foam options for couples and side/back sleepers.

• Who it is for

  • Side sleepers who need noticeable pressure relief without an extra-soft top

  • Couples who wake easily when a partner moves

  • Back sleepers who prefer a medium feel with targeted midsection support

• Who should skip it

  • Dedicated stomach sleepers who need a firmer, flatter surface

  • People who want quick, spring-assisted position changes

  • Anyone who regularly sits at the edge and needs a very stable perimeter

After letting the mattress expand for 72 hours, we followed our standard mattress testing process, checking its height and firmness before moving through repeatable tests for support, pressure relief, temperature control, motion isolation, responsiveness, and edge support. We compared spinal alignment on the back, side, and stomach; held each position long enough to catch pressure buildup; and timed how quickly the foam recovered after weight was removed. Three repeated drop tests measured how much movement reached the other side of the bed. We also sat and lay near the perimeter to find where support began to fade.

Our sample reached its full 12-inch profile after 72 hours and felt like a 5.5 out of 10 for firmness. The top gave way gradually rather than collapsing all at once. Under a 44-pound load, the shoulder zone compressed 1.9 inches while the firmer midsection zone compressed 1.3 inches. That difference was easy to feel on my side: the shoulder settled in without disrupting spinal alignment, while the waist stayed supported. On my back, the foam filled the space under the lower back without letting the hips drift downward.

Marcus, who alternates between his back and stomach, found the mattress comfortable on his back but noticed his hips settling too far when he stayed on his stomach. Jenna and Ethan focused on partner disturbance. In three drop trials, a 10-pound weight released from 12 inches produced an average peak reading of 0.11 g at a sensor 18 inches away, matching the calm feel they noticed when getting in and out of bed. The foam took 2.8 seconds to regain 90% of its height after the load was removed, so turns felt controlled but not effortless.

The Refresh Cover felt cool when we first lay down. From a starting surface temperature of 70.6°F, the bed reached 77.0°F after 30 minutes and fell to 72.4°F within 10 minutes of getting up. That is respectable for an all-foam mattress, but people who sleep very hot can still expect some warmth during long, still stretches.

• What we liked

  • The medium feel worked well for nights split between side and back sleeping

  • Movement stayed localized, even when a partner got out of bed

  • The zoned foam cushioned the shoulders while keeping the midsection steadier

• Who it is best for

  • Average-weight side and back sleepers

  • Couples who are easily disturbed by movement

  • People who like contouring but do not want an extra-soft surface

• Where it falls short

  • Dedicated stomach sleepers who need stronger support beneath the hips

  • Anyone who depends on a firm edge when sitting down or standing up

  • Combination sleepers who want fast, bouncy position changes

• Version tested: AS3 All Foam

• Mattress type: All-foam memory-foam mattress

• Feel: Medium

• Height: 12 inches

• Layers: 3-inch Bio-Pur comfort foam, 2-inch HIVE transition foam, and 7-inch Bio-Core base foam

• Zoning: Five-zone HIVE design with more give at the shoulders and hips and firmer support through the midsection

• Cover: Refresh Cover with a cool-to-the-touch surface; the brand says it is removable and washable

• Fiberglass: The brand states that the mattress is fiberglass-free

• Sizes: Twin, Twin XL, Full, Queen, King, California King, and Split King

• Shipping: Free in the continental U.S.; compressed in a box and shipped by FedEx, usually within two weeks

• Trial: 100 nights, with a 30-night adjustment period before a return

• Returns: The brand coordinates free pickup and a refund for eligible returns

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

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

• Price: Advertised from $999 at our latest check, down from a displayed $1,499 starting price; promotions can change

Choose the AS3 if you spend most of the night on your side or back, want the close cushioning of memory foam, and care more about strong motion isolation than bounce. It is particularly well suited to couples who wake easily and to sleepers who need pressure relief but dislike an extra-soft top. Look elsewhere if you sleep mainly on your stomach, change positions constantly, or use the edge as a seat every day.

For more lift at a similar general price level, the Helix Midnight is the stronger option. The Saatva Classic costs more, but its firmer choices, responsive dual-coil build, and in-room delivery make it a better fit for shoppers who want a traditional mattress experience.

The AS3 gives too much at the hips for many dedicated stomach sleepers, particularly those with more body weight through the midsection. Its edge works for sleeping but compresses noticeably when used as a seat. The cover starts cool, yet the foam still holds some warmth during long, still periods. Finally, the slower recovery that helps absorb movement also makes rapid position changes less fluid than they feel on a hybrid.

Amerisleep AS3 All Foam: Choose the AS3 for the quietest, most contouring feel of the three. It isolates movement exceptionally well and gives side sleepers strong pressure relief, but it has the softest seated edge and the least spring-assisted response.

Helix Midnight: This 11.5-inch medium hybrid is the closest price competitor. Its foam-and-coil build adds lift, easier movement, and a reinforced perimeter while still cushioning the shoulders and hips. The AS3 is better when motion control and a consistent foam feel matter most; the Midnight is better for combination sleepers who do not want to work as hard to turn.

Saatva Classic: The Classic is a premium step-up rather than a same-price substitute. Its 3-inch Euro pillow top, dual-coil construction, two height choices, and three firmness options create a more traditional, buoyant feel with stronger edge stability. It also includes in-room setup, but its current price sits well above the AS3 and it will transfer more movement than a solid foam core.

• Use at least the first 30 nights of the trial before making a final call on firmness

• Add a thin, breathable protector rather than a thick padded one if you want to preserve the cover's cool feel

• Pair the mattress with light, breathable bedding if you tend to sleep warm

• Rotate it from head to foot about every six months to encourage even wear; do not flip it

• If you sleep on your stomach, try a thinner pillow and watch for pressure or arching in the lower back

• If you share the bed, test your normal get-in and get-out routine early in the trial

• Use a solid platform or closely spaced slats so the foam layers have even support