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.

  • Firmness

    The Amerisleep AS4 mattress isn’t the softest bed they offer, but it’s very pleasantly plush. We rated it around a medium-soft on our own firmness scale.

  • Pressure Relief

    This mattress is great for pressure relief. The memory foam contours around your curves, and the soft profile makes it extra snuggly and conforming

  • Temperature

    Unlike traditional memory foam, we think the Bio-Pur foam in Amerisleep is more breathable and temperature neutral. It won’t help you sleep cold, but it does allow for increased airflow because of its open-celled construction. We’ve added the illustration below to give you an insight into all the air pockets inside the top layer.

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. 


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. 


In the center of AS4 is a thin layer of transition foam. It works to soften up the feel of the dense foam below.


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.

  • Amerisleep Mattress Cover

    One of the best perks about this bed, if you ask us, is its machine washable cover. Only a few beds, including Yogabed and Novosbed, have machine washable covers, and it makes it really easy to clean any stains or spills. Other people have to spot clean their mattresses if it gets dirty.

  • Durability

    Since this mattress is only made from foam, it won’t be as durable as any of the hybrid beds offered by Amerisleep. Though, it is more durable than your standard 10” or 11” mattress because it’s more on the thick side.

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.

  • Side Sleepers
    Good For
  • Back and Stomach Sleepers
    Not So Good For

    Unless you weigh under 230 lbs, back and stomach sleepers will probably need a bit more support. The bed’s softer profile probably won’t keep your spine in its ideal neutral alignment.

  • Combination Sleepers
    Not So Good For

    If you switch between your back and stomach, this likely won’t be a great bed for you. But, if you sleep on your side often, this bed’s medium-soft profile will likely be suitable for most combination sleepers.

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.

  • Petite Individuals

    People who weigh under 150 lbs or so will be perfectly fine on the AS4 mattress. Its all-foam design should be durable enough in the long-term, but you might think it feels like a medium more than a medium-firm.

  • Average Individuals

    For people in between the weight of 150 to 230 lbs, this mattress will be accommodating and comfortable. All-foam beds are ideal for petite and average-weighted individuals.

  • Heavy Individuals

    If you weigh over 230 lbs and really want a soft Amerisleep mattress, we recommend the AS3 Hybrid. It will feel around a medium to medium-firm because of the additional pressure applied to the bed, but it’s much more durable and supportive than the all-foam AS4.

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.

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Why Trust Us

Get the kind of sleep you’ve only dreamed of with some help from our team of mattress experts. We personally test more than 150 of the best sleep solutions from over 60 leading brands on site, so you can be sure you’re getting unbiased reviews, fair comparisons and personalized recommendations.

The Review Team

  • kenzie

    McKenzie Dillon

    Combo Sleeper

  • Tharon

    Tharon Green

    Stomach Sleeper

  • reynoso

    Jack Reynoso

    Combo Sleeper

  • JD

    JD Christison

    Combo Sleeper

Frequently Asked Questions
What does the AS4 mattress feel like?

AS4 is a dense memory foam mattress that has a medium-soft firmness level. It feels like a nice big hug.

How much does AS4 cost?

The AS4 mattress is one of the more pricey options from Amerisleep. A queen size retails around $2,100.

Is AS4 a good mattress?

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.

What if I don’t like my AS4 mattress?

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.

Should I purchase online or in a store?

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.