Casper launched in 2014. The brand’s flagship bed, the Casper, is made with a triple-layer polyfoam and memory foam comfort system, as well as a high-density polyfoam base layer. The mattress is considered ‘Medium’ in terms of firmness, or a 5.5 on the 1-10 firmness scale.
Amerisleep has been in business since 2007. The AS3 (formerly known as the Liberty) is included in the brand’s current line of memory foam mattresses. This model has a memory foam comfort layer, a dual-layer polyfoam support core, and a cover made of Celliant fabric, polyester, and spandex. The AS3 is considered ‘Medium’ (5.5) in terms of firmness.
Please note: Both Casper and Amerisleep offer other mattresses in addition to the models listed above:
Casper sells four other beds. These include the Casper Essential, a memory foam mattress; the Casper Wave, a memory foam and latex mattress; and the Casper Hybrid and Casper Wave Hybrid, both of which feature memory foam comfort layers and pocketed coils.
Amerisleep offers four other memory foam mattresses, each with a different firmness: the AS1 (7.5), AS2 (6.5), AS4 (4.5), and AS5 (3.5).
This page will exclusively compare the Casper and AS3 mattresses. For more information about other beds from these brands, please visit our Casper Mattress Reviews and Amerisleep Mattress Reviews pages.
The Casper and AS3 mattresses share the same ‘Medium’ (5.5) firmness, as well as other attributes including close body conforming and above-average motion isolation. However, they also differ in terms of other factors such as price-point and temperature neutrality. This guide will compare the unique pros and cons of each mattress, as well as the individual policies and overall reputations of both companies.
Specifies how long the product maintains structure, providing comfort and support before it begins to deteriorate. For reference, the average mattress lifespan is 6-8 years.
The Casper is built with a strong support system that gives it a longer-than-average expected lifespan of about seven years, though some body impressions may form over time.
Durability
x
Specifies how long the product maintains structure, providing comfort and support before it begins to deteriorate. For reference, the average mattress lifespan is 6-8 years.
The Casper is built with a strong support system that gives it a longer-than-average expected lifespan of about seven years, though some body impressions may form over time.
Motion Isolation
x
A measure of how effectively a mattress absorbs motion across its surface, preventing partner disturbance.
The Casper mattress absorbs and minimizes motion to a significant extent.
Motion Isolation
x
A measure of how effectively a mattress absorbs motion across its surface, preventing partner disturbance.
The Casper mattress absorbs and minimizes motion to a significant extent.
Off-gassing
x
Most new products emit chemical smells after being removed from packaging. Off-gassing odors are considered non-toxic, but can be quite unpleasant nonetheless.
The Casper may emit moderate off-gassing when new, but persistent odors should not be a major issue.
Off-gassing
x
Most new products emit chemical smells after being removed from packaging. Off-gassing odors are considered non-toxic, but can be quite unpleasant nonetheless.
The Casper may emit moderate off-gassing when new, but persistent odors should not be a major issue.
Pressure Relief
x
This refers to the degree to which a mattress molds to or cradles the contours of the body. This helps alleviate pressure point pain, especially on the hips and shoulders.
The Casper offers comfortable conforming and targeted pressure relief for most sleepers, particularly lighter side and back sleepers.
Pressure Relief
x
This refers to the degree to which a mattress molds to or cradles the contours of the body. This helps alleviate pressure point pain, especially on the hips and shoulders.
The Casper offers comfortable conforming and targeted pressure relief for most sleepers, particularly lighter side and back sleepers.
Temperature Neutrality
x
The temperature of a mattress throughout the night is affected by how much body heat is retained. Several factors affect temperature neutrality, including material composition, layer thickness, and dissipation of heat through airflow.
Casper mattresses absorb minimal body heat and sleep fairly cool compared to other memory foam mattresses.
Temperature Neutrality
x
The temperature of a mattress throughout the night is affected by how much body heat is retained. Several factors affect temperature neutrality, including material composition, layer thickness, and dissipation of heat through airflow.
Casper mattresses absorb minimal body heat and sleep fairly cool compared to other memory foam mattresses.
Edge Support
x
The degree to which the perimeter of the mattress supports body weight. In some cases, mattresses may sink when weight is applied. This sinkage, often called “roll-off”, affects how closely you might sleep to the edge of the bed.
The Casper offers good edge support due to its thicker support core, but some sinkage around the perimeter is likely over time.
Edge Support
x
The degree to which the perimeter of the mattress supports body weight. In some cases, mattresses may sink when weight is applied. This sinkage, often called “roll-off”, affects how closely you might sleep to the edge of the bed.
The Casper offers good edge support due to its thicker support core, but some sinkage around the perimeter is likely over time.
Noise
x
Certain mattresses – particularly those with coils – can be quite noisy when bearing weight. Others are nearly silent. Material composition is often the limiting factor for noise potential.
Casper mattresses are virtually silent when bearing weight.
Noise
x
Certain mattresses – particularly those with coils – can be quite noisy when bearing weight. Others are nearly silent. Material composition is often the limiting factor for noise potential.
Casper mattresses are virtually silent when bearing weight.
Sex
x
Mattresses that are bouncier and more responsive tend to be better for sex, as they’re easier to change positions on. In contrast, unresponsive mattresses can cause couples to have trouble switching positions.
Our testing indicates that The Casper isn't particularly responsive or bouncy, given it's construction. This may make is insufficiently bouncy for some couples, but this is on par with other mixed-foam beds.
Sex
x
Mattresses that are bouncier and more responsive tend to be better for sex, as they’re easier to change positions on. In contrast, unresponsive mattresses can cause couples to have trouble switching positions.
Our testing indicates that The Casper isn't particularly responsive or bouncy, given it's construction. This may make is insufficiently bouncy for some couples, but this is on par with other mixed-foam beds.
Durability
x
Specifies how long the product maintains structure, providing comfort and support before it begins to deteriorate. For reference, the average mattress lifespan is 6-8 years.
The AS3 earned above-average customer satisfaction ratings compared to similar memory foam options.
Durability
x
Specifies how long the product maintains structure, providing comfort and support before it begins to deteriorate. For reference, the average mattress lifespan is 6-8 years.
The AS3 earned above-average customer satisfaction ratings compared to similar memory foam options.
Motion Isolation
x
A measure of how effectively a mattress absorbs motion across its surface, preventing partner disturbance.
AS3 mattresses absorb and minimize motion transfer to a significant extent.
Motion Isolation
x
A measure of how effectively a mattress absorbs motion across its surface, preventing partner disturbance.
AS3 mattresses absorb and minimize motion transfer to a significant extent.
Off-gassing
x
Most new products emit chemical smells after being removed from packaging. Off-gassing odors are considered non-toxic, but can be quite unpleasant nonetheless.
Some noticeable off-gassing odors have been reported for AS3 mattresses, but these smells usually dissipate quickly.
Off-gassing
x
Most new products emit chemical smells after being removed from packaging. Off-gassing odors are considered non-toxic, but can be quite unpleasant nonetheless.
Some noticeable off-gassing odors have been reported for AS3 mattresses, but these smells usually dissipate quickly.
Pressure Relief
x
This refers to the degree to which a mattress molds to or cradles the contours of the body. This helps alleviate pressure point pain, especially on the hips and shoulders.
The AS3 has a medium feel and conforms quite closely for targeted pain and pressure relief.
Pressure Relief
x
This refers to the degree to which a mattress molds to or cradles the contours of the body. This helps alleviate pressure point pain, especially on the hips and shoulders.
The AS3 has a medium feel and conforms quite closely for targeted pain and pressure relief.
Temperature Neutrality
x
The temperature of a mattress throughout the night is affected by how much body heat is retained. Several factors affect temperature neutrality, including material composition, layer thickness, and dissipation of heat through airflow.
AS3 mattresses can trap heat for some sleepers due to their all-foam construction.
Temperature Neutrality
x
The temperature of a mattress throughout the night is affected by how much body heat is retained. Several factors affect temperature neutrality, including material composition, layer thickness, and dissipation of heat through airflow.
AS3 mattresses can trap heat for some sleepers due to their all-foam construction.
Edge Support
x
The degree to which the perimeter of the mattress supports body weight. In some cases, mattresses may sink when weight is applied. This sinkage, often called “roll-off”, affects how closely you might sleep to the edge of the bed.
The AS3 offers minimal edge support and sinkage is likely to occur along the perimeter.
Edge Support
x
The degree to which the perimeter of the mattress supports body weight. In some cases, mattresses may sink when weight is applied. This sinkage, often called “roll-off”, affects how closely you might sleep to the edge of the bed.
The AS3 offers minimal edge support and sinkage is likely to occur along the perimeter.
Noise
x
Certain mattresses – particularly those with coils – can be quite noisy when bearing weight. Others are nearly silent. Material composition is often the limiting factor for noise potential.
AS3 mattresses are virtually silent when bearing weight.
Noise
x
Certain mattresses – particularly those with coils – can be quite noisy when bearing weight. Others are nearly silent. Material composition is often the limiting factor for noise potential.
AS3 mattresses are virtually silent when bearing weight.
Sex
x
Mattresses that are bouncier and more responsive tend to be better for sex, as they’re easier to change positions on. In contrast, unresponsive mattresses can cause couples to have trouble switching positions.
The AS3 is softer and not very bouncy, and may not be responsive enough for couples.
Sex
x
Mattresses that are bouncier and more responsive tend to be better for sex, as they’re easier to change positions on. In contrast, unresponsive mattresses can cause couples to have trouble switching positions.
The AS3 is softer and not very bouncy, and may not be responsive enough for couples.
The Casper Mattress Is Good for...
Sleepers who prefer a ‘Medium’ mattress that provides close conforming
Those who frequently experience pain and pressure in their lower back and other sensitive areas
Couples
The Amerisleep AS3 Is Good for...
Sleepers who prefer ‘Medium’ firmness
Those needing pressure relief when side-sleeping, but with strong support to keep your spine aligned
People who normally sleep hot on all-foam beds
Sleep Position Ratings
Casper Sleeper Ratings
The Casper is considered ‘Medium’ (5.5) in terms of firmness. This feel is optimal for sleepers in the average weight group (130 to 230 pounds), and may also provide adequate conforming for lighter individuals. The mattress also isolates motion transfer very well and produces no noise when bearing weight, making it a good option for couples.
Amerisleep AS3 Sleeper Ratings
Like the Casper, the AS3 offers ‘Medium’ (5.5) firmness that balances body conforming and sleeper support. This setting is optimal for people who weigh between 130 and 230 pounds, and may also be suitable for lighter individuals; its thicker profile may be suitable for heavier people, as well. Edge support is another key strength; the AS3 is less susceptible to sinkage around the perimeter than many of its all-foam competitors. Other advantages include good motion isolation, no noise, and relatively cool sleep due to the Celliant-blended cover.
Casper
AS3
Weight
Light
Average
Heavy
Sleep Position
Less than 130 LBS
130 LBS - 230 LBS
Greater than 230 LBS
Side
Back
Stomach
Weight
Light
Average
Heavy
Sleep Position
Less than 130 LBS
130 LBS - 230 LBS
Greater than 230 LBS
Side
Back
Stomach
Our Recommendations
Choose the Casper if...
You want a mattress with ‘Medium’ firmness that conforms somewhat closely
You prefer low-profile beds
You and/or your sleep partner awaken easily due to noise or movement
You weigh 230 pounds or less
Choose the Amerisleep AS3 if...
You want a mattress with ‘Medium’ firmness that conforms somewhat closely
You usually sleep hot on all-foam beds
You prefer higher-profile beds
You weigh 230 pounds or less
Technical Details Comparison
Sizing and Pricing
Twin$595 The Casper$1,099 AS3
Twin XL$695 The Casper$1,149 AS3
Full$995 The Casper$1,249 AS3
Queen$1,095 The Casper$1,399 AS3
King$1,295 The Casper$1,699 AS3
Cal King$1,295 The Casper$1,699 AS3
Mattress Constuction
Now let’s see how the Casper and AS3 are made. The next table lists firmness, thickness, weight, and composition specs for both mattresses.
The Casper has three comfort layers – top and bottom polyfoam layers with a middle memory foam layer – that create a ‘Medium’ feel that provides close body conforming. Its single-layer support core is constructed from high-density polyfoam. This layer reinforces the bed and helps maintain an even sleep surface. The mattress has a 12-inch thickness profile, which is about average.
A queen-size Casper mattress weighs roughly 71 pounds. This is exceptionally light even by all-foam mattress standards, making the bed relatively easy to lift and rotate as recommended.
How Is the Amerisleep AS3 Built?
The AS3 is a memory foam mattress with a 3-inch comfort layer of 4 PCF foam. This material conforms closely with ‘Medium’ firmness. The bed’s cover is made of polyester blended with Celliant fabric, which helps the mattress absorb less body heat from sleepers and feel relatively cool as a result.
The AS3 has a thick support core consisting of a 2-inch transitional polyfoam layer and a 7-inch high-density polyfoam base. These layers reinforce the bed very well, helping to maintain a flat, even surface and help the mattress withstand sinkage around the edges better than other all-foam models. A queen-size AS3 weighs 88 pounds, which is slightly heavier than average, making the bed somewhat difficult to lift and rotate compared to the average all-foam mattress.
Casper Sleep Trial, Warranty, and Delivery
Sleep Trial 100 nights
Shipping Anywhere in the U.S. and Canada
Warranty 10 years, nonprorated
Made In USA
Trial Period Details
Casper offers a 100-night sleep trial for the Casper mattress.
This sleep trial does not require a break-in period. Customers may return the mattress for a full refund at any point of the 100-night trial.
In the event of a return, Casper will coordinate the removal of the mattress from the customer’s residence.
Full refunds are provided for all returns if the mattress is ordered from Casper. Those who buy their mattress from Amazon.com and other third-party retailers may need to pay additional fees.
Exchanges are offered during the 100-night trial. Exchanging for different mattress sizes or colors of the same mattress will void the remaining sleep trial; exchanging for a different Casper mattress model will necessitate a new 100-night trial.
Warranty Details
Casper offers a 10-year nonprorated warranty:
This warranty is entirely nonprorated.
The warranty will be voided if the mattress is not used with a firm, supportive foundation.
Casper covers all shipping costs related to repairing or replacing a defective mattress.
The warranty will cover the following defects:
Sagging or indentations in the sleep surface measuring 1 inch or deeper.
Physical flaws that cause mattress materials to split or crack.
Cover zipper defects.
The warranty will not cover the following:
Sagging or indentations in the sleep surface measuring less than 1 inch deep.
Burns, cuts, tears, stains, and other forms of physical damage resulting from misuse.
Repair or replacement requests that occur due to changes in the owner’s comfort preferences.
This warranty is non-transferable. It is only available to original owners who purchase the mattress from Casper or an authorized retailer. Those who buy or acquire the mattress from the original owner or non-authorized sellers will not qualify for warranty coverage.
Delivery Details
The delivery policy for Casper mattresses is as follows:
Most customers receive their mattress within two to seven business days after placing their order.
In addition to standard UPS delivery, which is free of charge, Casper offers White Glove delivery – including in-home mattress assembly – for a flat rate of $149.
How Is the Mattress Shipped?: Compressed and shipped in a box. Where Do They Ship?: Anywhere in the U.S. and Canada. Delivery Fee: Standard delivery is free of charge, while in-home assembly is $149.
Old Mattress Removal
Old mattress removal is available for those who select in-home assembly; there is no extra charge beyond the $149 flat fee. Old mattress removal is not offered with standard deliveries.
Casper Coupons and Discounts
Get $100 off The Casper Mattress as a Tuck reader.
Amerisleep offers a 100-night sleep trial for the AS3 mattress.
This sleep trial includes a mandatory 30-night break-in period. Full refunds will not be issued until the customer tests out the mattress for at least 30 nights.
In the event of a mattress return, Amerisleep issues a full refund and arranges for the mattress to be picked up from the customer’s residence at no extra cost.
This sleep trial is extended to customers who purchase their Amerisleep AS3 mattress on Amazon.com.
Warranty Details
Warranty
Amerisleep offers a 20-year warranty for the AS3:
This warranty is partially prorated. During the first 10 years of ownership, Amerisleep will repair or replace mattresses with defects at no extra charge to the owner. During years 11 to 20, Amerisleep will replace defective mattresses for 50% of the original product price; owners are also responsible for mattress shipping and transportation costs during this prorated period.
The warranty will be voided if the mattress is not used with a solid wood, non-spring, completely flat foundation or bed platform. Additionally, box springs must be used with at least three-quarters of an inch (3/4″) of plywood, and bases cannot have slats that are more than three inches (3″) apart.
The warranty will cover the following defects:
Sagging or indentations in the sleep surface measuring three-quarters of an inch (3/4″) or deeper.
The warranty will not cover the following:
Sagging or indentations in the sleep surface that do not measure three-quarters of an inch (3/4″) or deeper.
Burns, cuts, tears, stains, and other types of physical damage that occur due to misuse or neglect.
This warranty is non-transferable. It is exclusively offered to original owners who purchase their AS3 mattress from Amerisleep or an authorized retailer. Those who buy or acquire their mattress from the original owner or a non-authorized retailer will not be eligible for warranty coverage.
Delivery Details
Delivery Policy
The delivery policy for AS3 mattresses is as follows:
Amerisleep mattresses typically ship within three to five business days of the original order; once shipped, they reach their destination in one to five additional business days.
Free shipping is available to customers in the contiguous U.S. Those ordering from Alaska, Hawaii, or Canada can contact Amerisleep to learn about their current shipping rates.
All Amerisleep deliveries are coordinated through FedEx Curbside Delivery; a customer signature is not required.
How Is the Mattress Shipped?: Compressed and shipped in a box. Where Do They Ship?: All 50 states, as well as select locations in Canada. Delivery Fee: Shipping is free for all orders in the contiguous U.S., but additional charges will be applied for deliveries to Alaska, Hawaii, and Canada.
