Amerisleep AS4 Mattress Review

Scott White
Chief Sleep Researcher
Updated 3 Days Ago

The Amerisleep AS4 mattress is an excellent choice for side sleepers who prioritize plush comfort and targeted support. With its medium-soft feel and specifically designed foam layers, it cradles the shoulders and hips while resisting sagging. The use of eco-friendly materials and a washable cover add to its appeal. Enjoy a cool and comfortable sleep experience with the AS4 and take advantage of the 100-night risk-free trial.


Great for Side Sleepers: This mattress is designed to cater to side sleepers' needs. Its memory foam contours to the body, providing a hugging feeling and the needed support for side sleepers.

Performs excellently in terms of motion isolation. The design ensures you won't be disturbed by a restless partner, leading to a peaceful night's sleep.

Temperature-regulationg materials effectively dissipates excess body heat, ensuring a cool and comfortable sleep environment.

Our Recommendation

While this is a impressive option, one name stands out as our number one pick: the Saatva mattress. We rigorously research and review mattresses to help you find the perfect night's rest. Our top pick, the Saatva mattress, stands out for its unparalleled comfort, superior support, and durability. Crafted with eco-friendly materials and multiple firmness options, it's the cost-effective choice for your best sleep yet. Discover the magic of Saatva and elevate your sleep experience.



You're a back or stomach sleepers

You'd consider it a pricey investment


You want eco-friendly materials

You want a brand backed by a 20-year warranty

You like brands made in America

You want excellent motion isolation

You'd like cooling technology for temperature regulation

You want plush memory foam feel without feeling stuck

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 2024)?

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 2024.
  2. Puffy - feels like you're sleeping on a cool cloud (at a good price).
  3. Ghostbed - beautiful, plush cover w/ aerated latex and healthy spinal alignment.
  4. Winkbeds - 3-stage back relief with free shipping and returns.

Read our short, well-researched 10 Best Mattresses of 2024, here. Our ultimate goal is to help you pick your perfect mattress online, today!




What makes Amerisleep AS4 unique?

The Amerisleep AS4 stands out with its focus on side sleepers. Its specifically designed foam layers offer plush comfort and targeted support for the shoulders and hips, ensuring a comfortable sleep experience.

How does Amerisleep AS4 regulate sleep temperature?

The AS4 utilizes Bio-Pur® material with an open-cell design, allowing for better airflow and heat dissipation compared to traditional foam mattresses. This technology helps regulate sleep temperature and prevents overheating.

Can Amerisleep AS4 help with back pain?

The AS4 provides targeted pressure relief to the back, hips, and shoulders, which can help alleviate discomfort and promote proper spinal alignment. However, it's recommended to consult with a healthcare professional for personalized advice.

What is Amerisleep AS4's trial period and warranty?

Amerisleep offers a 100-night risk-free trial, allowing customers to try the AS4 in the comfort of their own home. Additionally, the mattress is backed by a 20-year warranty, showcasing its durability and quality.

Does Amerisleep AS4 offer free delivery?

Amerisleep offers free shipping and delivery within the contiguous United States, providing added convenience to customers.

Is Amerisleep AS4 environmentally friendly?

Yes, Amerisleep uses plant-based and eco-friendly materials that are certified by CertiPUR-US®. This certification ensures the absence of harmful chemicals and showcases their commitment to sustainability.

How does Amerisleep AS4's pricing compare to other brands?

The Amerisleep AS4 is priced on the higher end, reflecting its quality construction and features. While it may be considered a higher investment, it offers excellent value in terms of comfort and durability.

Can Amerisleep AS4 mattresses be used with adjustable bases?

Yes, Amerisleep AS4 mattresses are compatible with adjustable bases, allowing you to customize your sleeping position and find the most comfortable setting for your needs.

Is Amerisleep's customer service reliable?

Amerisleep has a reputation for reliable customer service, with a focus on addressing inquiries and concerns promptly. They strive to ensure customer satisfaction throughout the buying process and beyond.

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