Amerisleep is a popular company with a line of memory foam mattresses built for different types of sleepers. As the company grows in popularity, people naturally wonder which model in the line would be best for them. The AS3 and AS4 mattresses are two of the most popular offerings from the company that are similar but also slightly different – I’ll try to highlight the main similarities and differences between the two mattresses in this mattress comparison to help people if they are making the decision between the Amerisleep AS3 vs AS4. Note: The AS3 was formerly known as the Liberty and the AS4 was formerly known as the Colonial.

Amerisleep AS3 vs. AS4: Top Similarities

  • The mattresses come from the same company, so things like trial periods, return policies, and customer service quality will all be exactly the same.
  • Both mattresses use bio-based memory foams that are open-celled and more environmentally friendly.
  • Both are catered to side sleepers and combination sleepers who want great comfort and support.
  • Both feature a Refresh Cooling Cover, which is made with technology that is purported to improve circulation.
For more information on all mattresses from Amerisleep, check out the Amerisleep mattress reviews page.
AmerisleepAS3Layers
AS3 layers

Amerisleep AS3 vs. AS4: Key Differences

  • The AS4 is slightly softer, which may make it more appropriate for side sleepers.
  • The comfort layer of the AS4 is one inch thicker, which is ideal for side sleeping.
  • The AS3 costs $300 less than the AS4 because it is thinner overall.
amerisleep as3 vs as4
AS4 layers

Who Should Pick the AS3

  • People who are on a tighter budget (I think given the price range the AS3 is a slightly better value)
  • Those who are heavier and need a more supportive mattress
  • People who don’t exclusively sleep on their side but prefer back sleeping
amerisleep as3 featured image

Amerisleep AS3 Mattress

amerisleep as3 featured image
The Amerisleep AS3 is the brand’s most popular model and offers an excellent balance of comfort and support.
Clarity Score
4.1 / 5
Read Amerisleep AS3 Mattress Review
Check Price
Fourth of July Sale-Extended
Use code JULY600 and save $600 off mattresses

Product Details
Material
Foam
Firmness
Medium-firm: 6.5/10
Sleep Trial
100 nights
Warranty
20-year warranty
Shipping
Free shipping minus HI and AK
Price
$$$$$

Our Recommendation
We recommend this mattress for the following sleeper types:
Side Sleepers
This bed offers pressure relief at both the shoulders and hips, making it a great fit for side sleepers.
Back Sleepers
This bed’s strong support is ideal for back sleepers because it helps keep the spine neutrally aligned.
Stomach Sleepers
This mattress is ideal for stomach sleepers as its firm support promotes spinal alignment.

Financing Options

Financing options are available for this mattress.

Visit Amerisleep
Average Customer Rating
4.8 / 5
Watch Our Video Review
See the feel of the AS3 Bed in the video below.
 

Who Should Pick the AS4

  • People who are lighter in weight and don’t need as much support
  • Those who sleep almost exclusively on their side
Amerisleep AS4

Amerisleep AS4 Mattress

Amerisleep AS4
The Amerisleep AS4 is one of the brand’s softest models and should be a great fit for side sleepers.
Clarity Score
4.1 / 5
Read Amerisleep AS4 Mattress Review
Check Price
Fourth of July Sale-Extended
Use code JULY600 and save $600 off mattresses

Product Details
Material
Foam
Firmness
Soft: 6/10
Sleep Trial
100 nights
Warranty
20-year warranty
Shipping
Free shipping minus HI and AK
Price
$$$$$

Our Recommendation
We recommend this mattress for the following sleeper types:
Side Sleepers
This bed offers pressure relief at both the shoulders and hips, making it a great fit for side sleepers.
Back Sleepers
This bed’s strong support is ideal for back sleepers because it helps keep the spine neutrally aligned.

Financing Options

Financing options are available for this mattress.

Visit Amerisleep
Average Customer Rating
4.7 / 5
Watch Our Video Review
See the feel of the Amerisleep AS4 with the video below.

Bottom Line

The AS4 is slightly softer, so that is something to note for someone’s decision. I think the AS4 is perhaps the memory foam mattress that sleeps the coolest for me of any that I have slept on, but I think the AS3 Bed is a slightly better value because it costs $300 less than the AS4. Either way, they are both great options and I don’t think people can really go wrong with either one. Save with Amerisleep mattress coupons!