Amerisleep AS3 Vs AS4 Review

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Amerisleep is a popular company with a line of memory foam mattresses. 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. I’ll try to highlight the main similarities and differences between the two mattresses to help you if you are making the decision of AS3 vs AS4.

Note: The AS3 was formerly known as Liberty and the AS4 was formerly known as Colonial.

Key Similarities

  • Same trial periods / return policies / customer service
  • Both use bio-based memory foams
  • Both are catered to side and combo sleepers
  • Both have celliant in the cover

For more information on all mattresses from Amerisleep, check out my Amerisleep mattress reviews page.

Get $250 Off Any Amerisleep Mattress

AS3 layers

Key Differences

  • The AS4 is slightly softer
  • The comfort layer of the AS4 is one inch thicker
  • The AS3 costs $300 less than the AS4
AS4 layers

Pick The AS3 If:

  • You are on a budget (I think given the price range the AS3 is a slightly better value)
  • You are heavier
  • You don’t exclusively sleep on your side

See the feel of the AS3 Bed here

Pick The AS4 If:

  • You are lighter in weight
  • You sleep almost exclusively on your side

See the feel of the Amerisleep AS4 below


Bottom Line

The AS4 is slightly softer, so that is something to note for your 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 you can really go wrong with either one.

Check out my full AS3 Bed review and AS4 mattress review as well.

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Joe Auer

Joe Auer is the editor of Mattress Clarity. He mainly focuses on mattress reviews and oversees the content across the site.

He likes things simple and take a straightforward, objective approach to his reviews. Joe has personally tested nearly 250 mattresses and always recommends people do their research before buying a new bed. He has been testing mattresses for over 5 years now, so he knows a thing or two when it comes to mattress selection. He has been cited as an authority in the industry by a number of large publications.

Joe has an undergraduate degree from Wake Forest University and an MBA from Columbia University.

7 thoughts on “Amerisleep AS3 Vs AS4 Review”

  1. Hello, Thank you for doing these reviews, they have been so helpful! However we are having difficulty deciding between getting the AS4 or the AS5. I am 5’5″ 199 lbs and a side sleeper. My husband is 5’7″ 160lbs. He is a combination sleeper, but more side than anything. I have back pain issues from degenerative disc disease in the lumbar region. We are leaning towards the AS5, but worry that it will not be supportive enough? What is your opinion on which would be better?

  2. So what if you are a stomach sleeper? I am trying to sleep more on my side but usually end up on my stomach. I am 120 pounds. I am assuming AS3. I have a hybrid mattress now and have really loved it but it is letting my stomach area sink in while on my stomach so not making my back feel too great! And its just old so need to replace it and really don’t want to pay five grand for a new set!


  3. I am having a hard time deciding between the 3 and 4. Because there are two of us.
    I am 145 lbs and my husband is 200 lbs. We both sleep mainly on our sides. He, sometimes on his back.
    Which should we choose?

  4. I have tried Saatva luxury firm then Loom and leaf relax firm and both were great for my lower back for about 6 weeks then the pain came back. I’m now looking at the Amerisleep Liberty and would like your opinion on this mattress compared to the other two. I am 5ft 9in 140-150 lbs. sleep on my side and she is a side sleeper 105 lbs. 5ft 1in. . Any help would be appreciated. Thanks R Scott

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