Amerisleep AS3 vs Leesa Original: AS3 Wins for Hot Sleepers

Two medium-feel all-foam mattresses, two different answers to the same question: how do you keep a foam bed from trapping heat? The Amerisleep AS3 leans on a cooling cover and open-cell plant-based foam, while the Leesa Original pairs a breathable knit cover with a plant-based top layer and a cradling memory foam underneath. Both aim at the same balanced, not-too-firm, not-too-sinky middle. The split comes down to cooling technology and how much you value a longer trial window.

A strong alternative

Saatva Classicfor sleepers who want coils, not foam

• 365-night home trial
• Free white-glove delivery and old-mattress removal
• Lifetime warranty
• Three comfort levels and two mattress heights

Check today’s Saatva price →

Which mattress should you choose between the Amerisleep AS3 and the Leesa Original?

Based on Amerisleep’s published cooling claims for its Refresh cover and open-cell Bio-Pur foam, the AS3 is the better pick on paper for sleepers who overheat. The Leesa Original is the better pick for shoppers who want a straightforward, well-reviewed all-foam bed with a cradling memory foam layer and a 120-night trial. Both are medium-feel, both are 10 to 12 inches tall, and both avoid the deep sink of traditional memory foam.

The AS3 comes in an all-foam version and a hybrid version with coils, so hot sleepers who also want airflow through the mattress core have a second configuration to consider. The Leesa Original is all-foam only, built as a four-layer stack: a breathable knit cover or an optional Cooling Quilt Top, two inches of GreenFlex BioFoam, two inches of ultra-supportive memory foam, and six inches of durable support foam.

Who is the Amerisleep AS3 for?

The AS3 is built for sleepers who run warm and want a medium-feel foam mattress that actively pulls heat away from the body. Its Refresh Cover is made from a fiber with high energy transfer capabilities, and Amerisleep states the sleeping surface stays on average 7 degrees cooler over an eight-hour night. The plant-based Bio-Pur layer underneath has an open-cell design that lets more air circulate than traditional foam, which means less trapped warmth and less tossing to find a cool spot.

It also suits combination sleepers. Amerisleep describes the AS3 as balanced comfort and support for all sleeping styles, with HIVE technology delivering targeted support and airflow. The mattress is fiberglass-free, non-toxic, and made in the USA. Shoppers who want a coil option can choose the AS3 Hybrid instead of the all-foam build.

Who should buy the AS3, in one block: hot sleepers, combination sleepers who change positions at night, and anyone who prefers a medium feel with a cooling cover built in. The AS3 carries a 100-night trial, a 20-year warranty, and free shipping and returns. It was voted Newsweek Readers’ Choice Best Mattress of 2026 and is endorsed by the American Chiropractic Association, evaluated by board-certified doctors of chiropractic. The profile height is 12 inches, and the mattress is fiberglass-free and made in the USA of U.S. and imported parts.

Who is the Leesa Original for?

The Leesa Original suits shoppers who want a balanced, cradling foam feel without the sinking and overheating found in other memory foam mattresses. Its GreenFlex Foam is a plant-based, USDA Certified Biobased Product with an open-cell structure that lets heat escape rather than trap it, at a premium 3-pound density. Under that sits two inches of ultra-supportive memory foam that contours to the body and relieves back, hip, and shoulder pressure, on a six-inch high-density support base.

It is a good fit for couples who move at night. Independent lab testing by Naplab measured extremely low motion transfer, with an acceleration range of 7.88 m/s squared and a motion duration of 0.66 seconds, described as among the lowest they have tested. The Leesa Original holds 20,310 reviews on its own page, and all foams are CertiPUR-US certified, protected by a chemical-free and fiberglass-free fire barrier. It is designed and assembled in the USA.

How do the two mattresses feel and support you?

Both mattresses sit in the medium-feel middle, but they get there with different layers. The AS3 uses HIVE technology for targeted support and airflow, with Bio-Pur on top for contouring that snaps back to shape in seconds rather than leaving you sunk in. The Leesa Original uses a cradling memory foam layer over a high-density core, described as slightly moldable to the body while still providing great support.

Side sleepers get pressure relief at the hips and shoulders from either bed. Back and stomach sleepers will find the Leesa’s Signature Core Support base delivers lasting support across body types and sleep positions, while the AS3’s balanced build is pitched at all sleeping styles as well. If you want a firmer or softer feel than medium, neither of these two offers multiple firmness options, which is where a mattress with selectable comfort levels comes in.

Side-by-side specifications

Which one sleeps cooler?

The AS3 has the stronger cooling story on paper. Its Refresh Cover draws heat from the skin for a cool-to-the-touch feel, and Amerisleep states the surface stays on average 7 degrees cooler over an eight-hour night. The Bio-Pur layer’s open-cell design wicks away warm air and is more breathable than traditional foam. The AS3 also offers a hybrid configuration with coils for additional airflow through the core.

The Leesa Original counters with GreenFlex Foam’s open-cell structure, which lets heat escape rather than trap it, plus a breathable knit cover as standard. Shoppers who want more can upgrade to the Cooling Quilt Top cover, made from 73 percent polyester, 25 percent polyethylene, and 2 percent spandex. If heat is your main complaint, the AS3’s dedicated cooling cover and stated temperature figure give it the edge; if you want a plush upgrade path, Leesa’s quilt top option is worth a look.

What do trial, warranty and shipping look like?

The Leesa Original offers a longer trial at 120 nights against the AS3’s 100 nights, and its warranty is a limited lifetime warranty versus the AS3’s 20-year warranty. Both include free shipping. Leesa makes its mattresses to order in its Arizona Dream Factory and emails tracking details when the mattress ships, with optional In-Home Setup and Removal by Ryder available at checkout, usually scheduled 7 to 15 business days after purchase. Amerisleep advertises free, no-contact fast shipping with easy and free returns.

Neither trial window is short, so the difference matters most for sleepers who want the maximum number of nights to decide. The warranty difference matters most for long-term ownership: a limited lifetime warranty runs as long as you own the mattress under its terms, while a 20-year warranty has a defined end date.

Which mattress is the better value?

Value here is not about the sticker price, which shifts with sales and sizes. It is about what you get for the same spend. The AS3 bundles a named cooling cover, a targeted-support comfort layer, a fiberglass-free build, a 20-year warranty, and a choice of all-foam or hybrid construction. The Leesa Original bundles a plant-based USDA Certified Biobased top layer, CertiPUR-US certified foams, an independently measured low-motion-transfer build, 20,310 reviews on its page, a 120-night trial, and a limited lifetime warranty.

Shoppers who weigh cooling technology and a hybrid option will lean AS3. Shoppers who weigh trial length, warranty length, and a large public review count will lean Leesa. Both are fiberglass-free, which removes a common concern with bed-in-a-box foam mattresses.

Who should pick which?

Pick the Amerisleep AS3 if you sleep hot, want a medium feel with a cooling cover, and like the option of a hybrid build with coils. It is the stronger choice for combination sleepers who want targeted support that moves with them, and for anyone who values the Newsweek Readers’ Choice Best Mattress of 2026 recognition and the American Chiropractic Association endorsement.

Pick the Leesa Original if you want a cradling memory foam feel with a high-density support base, a longer 120-night trial, and a limited lifetime warranty. It suits couples who care about motion isolation, shoppers who like the option of a Cooling Quilt Top upgrade, and anyone who prefers a 10-inch profile over a 12-inch one.

Verdict: the Amerisleep AS3 wins this face-to-face for hot sleepers and combination sleepers, while the Leesa Original is the better fit for couples and long-trial shoppers.

World Sleep Almanac score: 8.2/10 for the Amerisleep AS3, judged on cooling technology and stated temperature performance, construction choice of all-foam or hybrid, trial and warranty terms, fiberglass-free materials, and public recognition including the Newsweek Readers’ Choice award. The score is editorial and reflects these criteria rather than any hands-on measurement.

Frequently asked questions

Is the Amerisleep AS3 available in a hybrid version?

Yes. Amerisleep lists the AS3 in two configurations: AS3 All Foam and AS3 Hybrid, which combines foam with coils. Both share the same medium feel and 12-inch profile, so the choice comes down to whether you want the bounce and airflow of coils or the uniform feel of an all-foam build.

Does the Leesa Original come with a cooling cover upgrade?

Yes. The Leesa Original offers two cover options: a Breathable Knit Cover made from 87 percent polyester and 13 percent viscose, or a Cooling Quilt Top made from 73 percent polyester, 25 percent polyethylene, and 2 percent spandex. The quilt top adds plush relief from the heat for sleepers who want more than the standard breathable cover.

Can either mattress be used with an adjustable base?

The Leesa Original page offers In-Home Setup and Removal by Ryder for delivery and setup in the room of your choice. For base compatibility with either mattress, check the specific foundation requirements listed by each brand before ordering, since bed-in-a-box foams and coil hybrids can behave differently on adjustable frames.

Are these mattresses fiberglass-free?

Both are. Amerisleep states the AS3 is fiberglass-free, eco-friendly, and non-toxic. Leesa states the Original is protected by a chemical-free and fiberglass-free fire barrier, and all of its foams are CertiPUR-US certified.

Reviewed by the World Sleep Almanac editorial team. Updated 2026.