For those of you who may not be familiar with Amerisleep and their brand, they offer many different mattresses, all ranging from soft to firm. If you want a medium firmness mattress, they have that option. If you want something plush but not too soft, you’ve come to the right review. The AS4 Amerisleep mattress is dubbed their best option for side and combination sleepers who look for that soft, pressure-relieving feel. If that sounds right up your alley, continue on below to our Amerisleep AS4 mattress review and find out what our unbiased thoughts are on this mattress.
Amerisleep AS4 Mattress Firmness and Feel

The AS4 mattress by Amerisleep is three layers thick, and the top layer utilizes the brand’s special memory foam material. As a result, the bed feels like a dense memory mattress, reminiscent of the Nectar mattress or the luxurious TempurPedic. Though memory foam tends to make it hard to switch positions, we did not have that experience with this bed.

Amerisleep AS4 Construction and Design
The AS4 Amerisleep mattress, as you read earlier, is made with three different layers. In total, it stands around 12” high.
Bottom
The bottom foam layer is made with 7” of Amerisleep’s Bio-Core foam. It feels dense and firm because its purpose is to provide a bulk of the bed’s support.
Middle
In the center of AS4 is a thin layer of transition foam. It works to soften up the feel of the dense foam below.
Top
The comfort layer of AS4 is Bio-Pur memory foam, and it’s the same on all of the Amerisleep beds. This is what gives the mattress its dense memory foam feel.
Sleeper Type Analysis
You probably have a sleeping position that you like sleeping in the most. Below, we break down how accommodating this bed will be based on your most dominant sleeping position.
Body Type Analysis
Your weight and BMI can alter the way a mattress feels. As a rule of thumb, the more you weigh, the softer a mattress is going to feel.
Will Amerisleep Beds Work For Couples?
For all the couples out there searching for the perfect mattress to share, you may want to take a bed’s motion isolation and edge support into account.
Motion Isolation and Noise
We placed a glass of water at the bottom of the mattress and rolled around to test how much the water moved. It didn’t spill or tip, and it barely shook. This mattress is great at absorbing motion, and you shouldn’t feel your partner in the middle of the night. It also won’t make any noise.
Edge Support
If you share a smaller mattress with your significant other, like a queen or full size bed, for example, we think you’ll be fine with the AS4 mattress. It’s not the greatest we’ve seen, but it’s also not the worst.
Amerisleep Pricing & Coupon Code
The softer the Amerisleep mattress, the more expensive it’s going to be. With that said, the AS4 Amerisleep mattress is one of the pricer beds offered by the brand. A queen size retails around $2,098. On the other hand, we’ve seen them run some generous discounts on this bed that bring down the price by $600 or more, making it a way better value.
Amerisleep Review Verdict
We don’t have anything negative to say about the Amerisleep AS4 mattress. If you’re a fan of dense memory foam and primarily sleep on your side, you’ll likely be a happy customer. It doesn’t make it hard to switch positions, it shouldn’t sleep warm, and it comes with an easy-to-clean machine washable cover. The only folks we don’t recommend it to are back sleepers, stomach sleepers, and people who weigh over 230 lbs.
Why Trust Us
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The Review Team
AS4 is a dense memory foam mattress that has a medium-soft firmness level. It feels like a nice big hug.
The AS4 mattress is one of the more pricey options from Amerisleep. A queen size retails around $2,100.
We think it’s a good mattress for side sleepers, or people who want a plush, soft mattress. It’s also ideal for sleepers under 230 lbs, but plus-size individuals can opt for AS3 hybrid.
If you don’t like your mattress, they offer a 100-night risk-free trial that allows you to return your bed (within the trial window) with no strings attached.
You get the added benefit of trying a mattress before you buy it from the store, but online retailers make the buying process really easy with free shipping, free returns, a risk-free trial, and a lengthy warranty.
Amerisleep Company Policies
There are some risks to purchasing online, so Amerisleep and most of the online mattress community try to make the purchasing process hassle-free, and they don’t ask for immediate commitment.
- Free shipping and returns
- 100-Night risk-free trial period
- 20-year warranty
Give your mattress about 24-48 hours to inflate fully. Remember, it showed up deflated inside of a cardboard box — it’ll take some time to completely expand.