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Amerisleep vs Casper: AS2 or The One?

Exact construction differences, practical benefits, seller terms, and who each mattress fits.

Amerisleep AS2 mattress
Amerisleep
AS2
$1,049
$1,549 reference
Queen
Check price at Amerisleep →
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Casper The One mattress
Casper
The One
$899
$1,149 reference
Queen
Check price at Casper →
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Start with what actually changes

The three differences that decide this comparison

These are verified construction or feature differences, followed by the reason a shopper may notice them. The full layer-by-layer comparison and a direct buying case for both mattresses continue below.

Literal layer construction

Amerisleep AS2
Refresh cooling cover + 2 inches Bio-Pur open-cell memory foam + 3 inches HIVE five-zone transition foam + 7 inches Bio-Core support foam
Casper The One
Cozy Cover + responsive open-cell Breathe Flex foam + Align+ memory foam + continuous high-density Casper Core

Why it matters: AS2 puts memory foam directly beneath the cover, so the first response is closer contouring, followed by a thick zoned transition layer that controls how far the body settles. The One puts its breathable, quicker-moving comfort foam on top and memory foam second. Choose AS2 when you want the hug and pressure distribution of memory foam at the surface. Choose The One when you want a more responsive first contact with memory-foam contouring underneath it.

Five support zones vs continuous support

Amerisleep AS2
HIVE uses five zones: firmer support beneath the head, back, and legs with more cushioning beneath the shoulders and hips
Casper The One
The high-density Casper Core provides continuous support; Casper does not publish separate zones for The One

Why it matters: AS2 changes the response across five body areas, making it the clearer option for shoppers who specifically want targeted cushioning beneath the shoulders and hips plus firmer support through the torso. The One uses one continuous support core, so its feel should be more uniform from head to foot. Choose the zoning only when that targeted response matters; continuous support is a valid simpler choice for shoppers who prefer a consistent surface.

Medium-firm feel and movement

Amerisleep AS2
Medium-firm; contouring Bio-Pur memory foam with a responsive design over HIVE transition foam
Casper The One
Medium-firm; responsive Breathe Flex foam over contouring Align+ memory foam

Why it matters: AS2 is the stronger fit when you want a supportive memory-foam feel that molds closer to the body without using slow traditional foam. The One is easier to recommend to combination sleepers who dislike an immediate memory-foam hug, because Breathe Flex responds before the Align+ layer begins to contour. Couples should get useful motion absorption from either all-foam build, while The One's livelier surface may feel easier to turn on.

See every literal difference and who benefits →
Feature
Amerisleep
AS2
Casper
The One
Overview
Type
Memory FoamMemory Foam
Firmness
Published feel or standardized wording
Medium-FirmMedium-Firm
Queen Price
Current / sale price
$1,049$899
Trial Period
Terms from the linked seller
✓ 100 nights at Amerisleep; 30-night minimum; free pickup✓ 100 nights at Casper; returns after 30 nights; free eligible return
Warranty
20 years10 years
Performance Ratings
Cooling
Hot sleepers
Very goodAverage
Motion Isolation
Partners, light sleepers
ExcellentExcellent
Pressure Relief
Shoulder and hip cushioning
GoodGood
Edge Support
Sit/sleep near edge
AverageFair
Durability
Long-term performance
AverageGood
Compatibility & Features
Adjustable Base
Head/foot elevation
✓ Yes✓ Yes
Split King Support
Two Twin XL per couple
✓ Yes✓ Yes
Financing
Affirm, KlarnaAffirm
Materials & Certification Scope
Listed certifications / claims
Check model and material scope
  • CertiPUR-USpolyurethane foam program; not whole-mattress certification
None listed
Certificate limitations
Not an odor or safety guarantee
Confirm the certificate for the exact model and covered materials. A material certificate does not certify every part of a mattress or guarantee no odor.Confirm the certificate for the exact model and covered materials. A material certificate does not certify every part of a mattress or guarantee no odor.
Best For
Ideal sleeper profiles
  • ✓Back sleepers
  • ✓Stomach sleepers
  • ✓Memory foam shoppers
  • ✓Couples
  • ✓Back sleepers
  • ✓Combination sleepers
  • ✓Couples
  • ✓Value shoppers
Actions
Full ReviewCheck price at Amerisleep →

Buy with confidence

100-night risk-free sleep trial at Amerisleep

Full ReviewCheck price at Casper →

Buy with confidence

100-night Casper comfort guarantee at Casper

Check price at Amerisleep — AS2 →Check price at Casper — The One →
Which one fits you

Our buying recommendation

Buy Casper The One for the stronger price-first value when you want a responsive medium-firm foam mattress and do not need targeted support zones. Buy Amerisleep AS2 when its literal upgrades address your needs: five-zone HIVE support, memory foam at the surface, a cool-to-the-touch Refresh cover, published layer depths, and a 20-year limited warranty. Both direct purchases include a 100-night comfort guarantee with free eligible returns after the adjustment period, so the choice should turn on support design, surface feel, cooling features, and the live price difference.

Still deciding? Take our 2-minute mattress quiz →

Amerisleep vs Casper: AS2 or The One?

Choose Casper The One when the lowest live price and a responsive medium-firm surface matter most. Choose Amerisleep AS2 when you want a taller 12-inch build, memory foam directly beneath the cover, five-zone HIVE support, a cool-to-the-touch cover, and a 20-year limited warranty. Both are all-foam mattresses with 100-night direct trials, but The One uses continuous support while AS2 changes the response beneath five body areas. Use the live Queen cards above for today's exact price difference.

Official Amerisleep AS2 mattress
Amerisleep AS2 combines a cool-to-the-touch Refresh cover with Bio-Pur memory foam, five-zone HIVE support, and a Bio-Core base.
Casper The One 11-inch foam mattress
Casper The One uses an 11-inch foam build with Breathe Flex foam, Align+ memory foam, and a continuous Casper Core.

Cooling approach

Amerisleep AS2
Cool-to-the-touch Refresh cover + open-cell Bio-Pur foam + ventilated HIVE geometry
Casper The One
Breathable Cozy Cover and open-cell Breathe Flex foam; no active cooling system or cool-to-the-touch cover claim

Why it matters

AS2 gives a hot sleeper the more complete cooling package on paper because it addresses the cover, the comfort foam, and the transition layer. Amerisleep says its Refresh cover keeps the sleeping surface up to 7 degrees cooler over eight hours than a traditional polyester cover; that is a manufacturer comparison rather than a SleepRanked lab result. The One still improves airflow through its top foam, making it a reasonable value choice when basic breathability is enough.

Current Queen price and long-term value

Amerisleep AS2
See the live Queen offer card above; approved direct Amerisleep shopping path
Casper The One
See the live Queen offer card above; current direct Casper product page

Why it matters

Use the live cards for today's totals because promotions can change. The One is the confident value choice when its responsive surface and continuous support meet your needs. AS2 earns a higher total only when you value its extra inch of height, fully disclosed foam depths, five-zone HIVE layer, cooling cover, and longer warranty.

Direct-purchase comfort guarantee and warranty

Amerisleep AS2
100-night home trial, returns after the first 30 nights, free return pickup, full refund, and 20-year limited warranty
Casper The One
100-night home trial, returns after the 30-night adjustment period, free courier pickup, full refund, and 10-year limited warranty

Why it matters

Both shopping buttons open the brands' own stores, so each mattress can be tested at home for the same 100 nights and eligible returns are picked up without a return fee. The meaningful difference comes after the trial: Amerisleep covers AS2 for 20 years, with full repair or replacement coverage during the first 10 years and prorated coverage during the second 10. Casper's mattress warranty lasts 10 years. That longer coverage strengthens AS2's value without making Casper's trial any less reassuring.

Who benefits from each mattress?

Use the differences above to match the mattress to the way you sleep. Each model has a clear reason to buy. When one costs less, choose it if it already delivers the feel, support, and temperature control you want. Pay more when the added material or feature gives you a benefit you expect to notice every night.

Choose Amerisleep AS2 if:

  • You want medium-firm memory-foam contouring with more targeted support beneath the shoulders, hips, back, and legs.
  • You regularly sleep warm on foam and want cooling features in the cover, comfort layer, and transition layer.
  • You value a 20-year warranty and fully disclosed layer depths after the same 100-night direct trial length.

Choose Casper The One if:

  • You want the lower live price and prefer responsive Breathe Flex foam above the slower contour of Align+ memory foam.
  • You prefer continuous support rather than paying more for five distinct response zones.
  • You want Casper's current entry foam mattress with free shipping, a 100-night trial, and a 10-year limited warranty.

Advantages and trade-offs

Both mattresses can be a strong purchase. These are the clearest strengths you gain and the compromises you accept with each one.

Amerisleep AS2

Advantages

  • Its 2-inch Bio-Pur, 3-inch HIVE, and 7-inch Bio-Core layers disclose exactly where the 12-inch profile goes.
  • Five support zones create a more targeted shoulder, hip, torso, head, and leg response than The One's continuous core.
  • The Refresh cover and two airflow-oriented foam layers give hot sleepers a clearer cooling story.
  • Its 20-year limited warranty doubles Casper's stated warranty length.

Trade-offs

  • Memory foam is the first comfort layer, so shoppers who dislike close surface contour may prefer The One's livelier top foam.
  • The 7-degree Refresh figure is Amerisleep's comparison claim rather than an independent SleepRanked measurement.

Casper The One

Advantages

  • Breathe Flex foam makes it easier to move before Align+ memory foam begins to contour.
  • Its continuous core creates a consistent support response instead of five distinct zones.
  • The One is orderable directly from Casper with free shipping and a 100-night home trial.

Trade-offs

  • It is one inch shorter and does not include AS2's five-zone HIVE layer or cool-to-the-touch cover claim.
  • Casper does not publish the individual layer thicknesses, and its 10-year warranty is shorter than Amerisleep's.

Compare the closest alternatives before deciding

Use these adjacent matchups if a slightly softer Amerisleep feel, a Casper hybrid, or another value foam mattress is closer to your needs.

Amerisleep AS3 vs Casper The One →Compare Casper's value model with Amerisleep's medium-feel AS3 when AS2 sounds too firm.Casper Dream vs Casper The One →See whether coils, zoning, and a reinforced edge justify moving up within Casper's lineup.Casper The One vs Tuft & Needle Original →Compare two responsive value foam mattresses with different comfort-layer designs.

Published construction details and claims are from Amerisleep's current AS2 construction, price, and direct-purchase terms, Amerisleep's current mattress warranty terms, Casper The One's current construction, Queen price, and direct-purchase benefits, Casper's 100-night comfort-trial and return terms and Casper's 10-year limited mattress warranty. SleepRanked rechecked both exact product pages, current Queen offers, direct trial terms, and warranties on September 24, 2026. The live Queen offer cards are the price authority. Cooling, response, pressure-distribution, and support commentary translates the manufacturers' published designs into practical buying guidance; SleepRanked has not independently lab-tested these mattresses. Amerisleep's 7-degree Refresh figure is a manufacturer comparison claim.

Price Comparison (Queen)

MattressRegular priceCurrentSale?
Casper The One$1,149$899Save $250
Amerisleep AS2$1,549$1,049Save $500

The Casper The One is the lower-priced choice at $899. The Amerisleep AS2 costs $150 more — 17% above the lower current price. Weigh that premium against the literal differences above and the benefits you expect to notice. Both are currently below their listed comparison prices.

Amerisleep AS2

Full ReviewSee Today’s Price →

Casper The One

Full ReviewCheck price at Casper →

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