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Casper vs. Amerisleep Mattress Review

These all-foam beds share firmness levels and many other attributes, but they differ in price point, among other things. Learn the pros and cons of each mattress and how to decide which is the best for you in this review.

Comparing Casper & Amerisleep Mattresses

The Casper Original, Casper’s flagship mattress, is a memory foam bed-in-a-box that offers a balanced, medium feel for great pressure relief and support. The Amerisleep AS3 mattress is a memory foam mattress that’s also medium, features a Celliant cover, and has a true memory foam cradle. These are some of the best memory foam mattresses, sharing some qualities like firmness level, style, and the fact that they’re best suited for lightweight and heavyweight sleepers. However, each brand offers a distinct sleep experience. 

If you love the feel of memory foam or are physically active, we recommend the AS3. If you like a neutral foam feel, are on a budget, or want to be sure the bed you purchase will work for almost anyone, we recommend the Casper. In this mattress comparison, we’ll uncover more details to help you make a confident decision about which is the right new mattress for you.

Differences

  • Feel—The Amerisleep AS3 has a true memory foam feel, and the Casper mattress has a neutral soft foam feel.
  • Cover—The AS3 has a celliant cover, which is designed to promote recovery for active people and athletes by encouraging circulation and restful sleep. It’s also machine-washable.
  • Price—The Casper mattress is roughly $300 less than the Amerisleep in a Queen size, and that’s before any discount codes are applied.
  • Zoned Support Structure—The center third of the Casper is more firm, providing zoned support in the area of the body where people carry the most weight (hips and trunk).
  • Hybrid Option—The Casper mattress is only available as a mixed-foam bed, but the AS3 is available as an all-foam or hybrid bed.

Related: Memory Foam vs. Hybrid

Similarities

  • Style—The AS3 and the Casper Original are all-foam beds that contain polyfoam, memory foam and proprietary foams.
  • Firmness Level—Both beds share a medium firmness setting that’s neither too firm nor too soft, meaning it can support multiple sleep positions.
  • Conforming—The beds’ medium feel and top foam layers provide comfortable conforming and pressure relief for almost every sleeping type.
  • Motion Isolation—Both mattresses absorb and minimize motion transfer to a significant extent.
  • Weight Support—Both beds are best for lightweight and average weight sleepers. Heavyweight sleepers may experience too much sinking.

Casper Original

The original mattress that made the brand famous, the Casper is known for its design that suits all sleep positions. Casper's Zoned Support feature is engineered to prop up the hips, shoulders, and back to keep the spine aligned. At an affordable price point too, this mattress is hard to beat.
Score
4.8 / 5.0
Firmness

6

Trial period

100 nights

Warranty

10 year warranty

Who the Casper Mattress is Best For 

Best For…

  • People who like a neutral foam feel
  • Shoppers looking for a universally accommodating mattress
  • Shoppers on a budget
  • People who normally sleep hot on all-foam beds

May Not be Best For…

  • Shoppers looking for a very soft or very responsive mattress
  • Heavyweight sleepers

Read our full Casper mattress review to learn more! 

Amerisleep

Since 2007, AmeriSleep has been working to find eco-conscious ways to make foam mattresses that customers can sleep on comfortably and safely. The result is 5 memory foam mattress models, all of which are made with eco-friendly, plant-based materials.
Score
4.8 / 5.0
Firmness

Varies

Trial period

100 nights

Warranty

20 year warranty

Who the Amerisleep Mattress is Best For 

Best For…

  • People who like a memory foam feel
  • Athletes and regular exercisers
  • Shoppers with a moderate budget
  • Strict side sleepers

See: Best Mattresses for Side Sleepers

May Not be Best For…

  • Shoppers looking for a responsive mattress
  • Heavyweight sleepers

Read our full Amerisleep mattress review to learn more! 

Deciding Between Casper & Amerisleep

Firmness / Feel

Both the Casper and the Amerisleep AS3 have a medium firmness setting, which corresponds to roughly a 5.5 or 6/10 on the firmness scale of 1 to 10. On this scale, 1 is very soft and 10 is very firm. These beds fall right in the middle of the spectrum, which means they won’t feel too plush or too hard and can accommodate the preferences of a wide variety of sleepers.

While the mattresses have the same firmness level, that doesn’t necessarily mean they feel the same. The Casper’s inversion of its comfort layers (polyfoam followed by memory foam) gives it a neutral feel, which simply means you might not even detect the memory foam when you first lie down. The Amerisleep has a classic memory foam feel, so if you like to sink deeper into the mattress, you’ll probably prefer the AS3. 

Motion Isolation

A bed with good motion isolation will keep you from being woken up by your partner if they toss and turn or get out of bed in the middle of the night. The best mattresses for couples include all-foam beds, that do a great job of limiting motion transfer, so it’s not surprising to see that the Casper Original and AS3 both reduce motion well. However, the AS3’s thicker memory foam layers may reduce bounce and motion a little more than the Casper’s top polyfoam comfort layer.

Edge Support

When a mattress has great edge support, it means that people who sleep with a partner or like to sprawl out at night will be able to use the mattress’ entire surface area and feel properly supported. The Casper outperforms the AS3 in this category simply because the Amerisleep AS3 tends to sink when pressure is applied at the edges. Beds with more memory foam than average tend to have issues with indentations and sinking, so this comes at no surprise.

Pressure Relief 

While back and stomach sleepers require firm, even surfaces to support the body, side and combination sleepers need pressure relief in key areas (the hips and shoulders). The balanced firmness settings and construction of the Casper and the AS3 help ensure that they’ll provide a decent amount of relief in any sleeping position. We think all sleeping positions will find the pain relief they need on either mattress, but if you’re a dedicated side sleeper or are lightweight, you might find that the additional sinking on the AS3 helps you achieve a better night’s sleep.

Spine Alignment 

The idea behind a mattress that’s not too firm or too soft is that you can ensure your spine stays in proper alignment regardless of whether you’re a back sleeper, side sleeper, stomach sleeper, or combination sleeper. The Casper incorporates a zoned support system which helps the Casper support sleeper types in all positions even though it doesn’t feel like a very firm bed. Similarly, the AS3 is Amerisleep’s most versatile bed. It should provide nice alignment (maintain the natural ‘S’-curve of the spine) in all sleeping positions if you’re lightweight or average weight.

Durability 

Mattresses aren’t exactly cheap, which means durability should be a key consideration for every shopper. All-foam beds, which tend to sink and breakdown over time, aren’t as durable as hybrid and innerspring models. The average lifespan of a foam bed is about seven years, and the Amerisleep AS3 and Casper Original are on par with this. We recommend rotating the mattress every three to six months to prevent sagging and indentations.

Temperature 

Temperature regulation is correlated with a number of mattress characteristics, ranging from mattress firmness to mattress type and specialty cooling foams. In general, softer mattresses sleep hotter, and hybrid mattresses provide more airflow than all-foam beds. Neither the AS3 nor the Casper sleep particularly hot, but they also don’t sleep cool. You’ll find yourself temperature neutral on either of these mattresses. If you struggle with sleeping hot, you might want to consider the hybrid version of the AS3, which will encourage breathability and airflow at night.

Related: Best Cooling Mattresses

Casper vs. Amerisleep Mattress Construction 

Casper Original Amerisleep AS3
Cover 100% Polyester Celliant Polyester Blend
Comfort Layer  1.5” Polyfoam

1.5” 4 PCF Memory Foam

3” 4 PCF Memory Foam
Transitional Layer 1.5” 2 PCF Polyfoam 2” 1.65 PCF Polyfoam
Support Layer 7.5” 1.8 PCF High-Density Polyfoam 7” 1.8 PCF High-Density Polyfoam
Mattress Thickness  12” 12”

Casper Construction

The Casper Original is a memory foam mattress with a medium firmness setting and a balanced feel that combines pressure relief and support. 

The cover on the Casper is 100% polyester and has a soft feel. It’s also removable via a zipper, but Casper doesn’t explicitly state that it is machine washable. 

Its simple foam construction is topped with a layer of open-cell Casper AirScape foam, a layer of memory foam and a thicker support foam at the base. The AirScape foam gives the Casper its neutral feel and light bounce. The second layer of memory foam, which measures 2” tall, is zoned to provide different levels of support for the neck, hips and lower body.

The 7” high-density polyfoam core helps stabilize the Casper and makes it supportive enough for all but heavyweight sleepers. It also helps the Casper avoid sinking at the edges a little more than most memory foam beds. The mattress measures 12” tall and its combination of foams give it the universally accommodating feel that’s made the Casper Original so popular in the bed-in-a-box market.

Amerisleep Construction

The AS3 is a memory foam mattress that combines Bio-Core foam, Bio-Pur memory foam and a Celliant cover for recovery.

The Celliant cover is removable, but it requires hand washing. It has a stretchy feel and is designed to convert a sleeper’s body heat and transmit it back to the body as infrared energy to encourage oxygenation, circulation, and recovery.

The comfort layer in the AS3 is 3” of Bio-Pur foam, which is an open-cell, proprietary foam by Amerisleep that helps the bed sleep a little cooler and gives the mattress its viscous feel. This is followed by a transitional layer of 2” high-density foam, which prevents the sleeper’s body from sinking into the firmer support core.

The base of the AS3 is 7” of high-density polyfoam. It is dense and firm, helping the mattress stay durable and resist sagging. Altogether, it measures 12” thick. The AS3 is also available as a hybrid with pocketed coils, which improve breathability, durability and support.

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Sizing & Price Comparisons 

Mattress Size  Casper Price  Amerisleep AS3 Price 
Twin $595 $1,099
Twin XL $695 $1,149
Full $995 $1,249
Queen $1,095 $1,399
King $1,295 $1,699
California King $1,295 $1,699
Split King N/A $2,098

Shipping and Returns for Casper & Amerisleep

In-home sleep trials, free shipping and generous warranty coverage have come to be expected in the online mattress industry, and you’ll get all three of these things regardless of which bed you choose.

The Amerisleep AS3 comes with a 100-night sleep trial, ships free to the contiguous USA, and is backed by a 20-year warranty. The Casper comes with a 100-night sleep trial, free shipping to the contiguous USA, and a 10-year warranty.  Both beds are available at their respective websites and at various retailers like Amazon and Target.

More Casper Mattresses

Casper Hybrid

Striking the perfect balance between the contour of memory foam and the bounce of pocket-coils, the Casper Hybrid offers the best of both worlds when it comes to superior comfort and support.

See our full Casper Hybrid Mattress Review to learn more.

Casper Nova Hybrid

Extra plush foam makes this Casper's softest hybrid mattress yet. With 7 zones of specialized support, you don't have to worry about it being too plush, as your spine will stay perfectly aligned all night. The cradling comfort foam combines with 2 layers of perforated cooling foam that promotes air flow and prevents heat trapping.

Check out our full Casper Nova Mattress Review to learn more. 

More Amerisleep Mattresses

Amerisleep AS1

The firmest of Amerisleep's five mattress models, the AS1 offers a gentle but firm support.

See our full Amerisleep Mattresses Review to learn more about the brand.

Amerisleep AS2

The best mattress from Amerisleep for stomach and back sleepers who like a medium-firm firmness level. This mattress is made to appeal to a wide range of sleepers and comes with a reasonable price point.

Our Casper vs. Amerisleep Final Review

Still having trouble distinguishing between these two popular bed-in-a-box options? Here’s the bottom line. If you want a safe pick that almost anyone who lays on the mattress is near guaranteed to either love or feel fine sleeping on, we recommend the Casper. If you love the feel of memory foam, are a dedicated side sleeper or athlete, or have a slightly larger budget, we recommend the Amerisleep AS3. Read more about each bed in our full Casper Original and Amerisleep reviews.


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