Amerisleep AS4 Mattress Review

Updated May, 2021
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While Amerisleep AS4s is a fantastic mattress at this price point, our #1 pick for 2021 is SAATVA mattress. Saatva is a luxury mattress shipped to your door (unlike other bed in a box brands dropped off on your doorstep) w/ FREE white-glove delivery & setup. They have over 50,000 5-star reviews, and they're incredibly comfortable (for all sleep positions).

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Bottom Line

The Amerisleep AS4 mattress blends the softness you want with the support you need. Designed specifically for side sleepers, it provides plush comfort that cradles your shoulders and hips. It uses eco-friendly, heat-wicking materials to keep you sleeping cool and comfy. Try the AS4 for 100-nights risk-free, today!

Get Amerisleep AS4 if...

  • You're a side sleeper. The Amerisleep AS4 is made with side sleepers in mind. The top foam layer is very soft and it works incredibly well at cradling your hips and shoulders.
  • You tend to sleep hot. Amerisleep's Bio-Pur® material layer features an open-cell design that allows more air to circulate than traditional foam beds.
  • You want a mattress with support. Amerisleep's construction provides targeted pressure relief to your back, hips, and shoulders, simultaneously resisting sagging.

Skip Amerisleep AS4 if...

  • You dislike memory foam. The AS4 is built with several layers of foam and gives that sinking feeling of classic memory foam.
  • You sleep predominately on your back or stomach. The AS4 has a medium-soft feel that back and stomach sleepers might find unsupportive. Instead, you should consider one of Amerisleep's firmers models.


  • Eco-friendly. They use plant-based and eco-friendly materials certified by CertiPUR-US®.
  • Backed by a 20-year warranty.
  • Amerisleep mattresses are proudly made in America.


  • A bit pricey, definitely an investment


Amerisleep AS4 has a medium-soft feel, ranking 5/10 on the firmness scale. This mattress works best for side sleepers who want plush comfort with targeted support for hips and shoulders.  

Construction Key Points

  • The AS4 has a height of 12".
  • Cover: Features a zip-off cover that's washable, keeping your bed fresher for longer.
  • First Layer: The top layer is made with Bio-Pur®. This plant-based material has an open-cell design that keeps you cool throughout the night.
  • Second Layer: The Hive® transition layer features hundreds of foam hexagons grouped into 5 comfort zones. These expertly cushion and support your head, shoulders, back, hips, and feet to keep you properly aligned.
  • Third Layer: The Bio-Core® base layer provides strong support that doesn't sag or leave indentations.

Support & Motion Isolation

Because of the all-foam design, the AS4 does an excellent job at eliminating motion transfer. The thick layers absorb motion incredibly well; especially important if you sleep with a very active sleep partner.

As for edge support, it's decent but not great. Foam mattresses aren't known for having the best edge support, so it was to be expected. While it does compress if you sit or lie near the edge of the bed, you won't feel as if you're going to fall off.

Reasons to Buy Amerisleep AS4

  • This is an excellent choice if you want to sleep cool. The plant-based Bio-Pur® material's open design creates multiple air channels that continually allow air to flow in, and heat to flow out, so you don't sleep hot.
  • You get that plush memory foam feel without getting stuck. The 4" of soft foam responds very quickly, making it easy to move around on the mattress.
  • This mattress does a great job at isolating motion. If you sleep with a partner, you won't disturb their sleep with your movements and vice versa.

Reasons to Avoid Amerisleep AS4

  • If you're a back or stomach sleeper, you're going to find this mattress too soft for your needs. Opt for one of Amerisleep's firmer models.
  • If you're on a budget, looking to spend $500 or less, the Amerisleep AS4 is outside of this price range.

Amerisleep AS4 is an ideal choice if you want a soft, yet supportive mattress designed specifically for side sleepers. You can get 30% off Amerisleep AS4, today!

Where can I find a great, affordable mattress (in 2021)?

If you're searching for an affordable mattress that offers a wide range of comfort and pressure relief, we've compiled a list of mattresses for you to consider:

  1. Saatva Mattress - fantastic for all sleep positions, and is rated our Best Mattress of 2021.
  2. Idle Sleep - great for responsive pressure relief.
  3. Puffy - feels like you're sleeping on a cool cloud (at a good price).
  4. Ghostbed - beautiful, plush cover w/ aerated latex and healthy spinal alignment.
  5. Winkbeds - 3-stage back relief with free shipping and returns.

Read our short, well-researched 10 Best Mattresses of 2021, here. Our ultimate goal is to help you pick your perfect mattress online, today!

Check Price →
Get $200 off, purchases over $1000!

Saatva is our top pick for the #1 mattress in 2020! They're a luxury mattress shipped with FREE white-glove delivery & setup (different than regular bed in a box brands put on your doorstep). They have over 50,000 reviews.

Check Price →
Get $200 off your order of $1,000 or more, today!