AS4

Formerly known as Colonial

The AS4 is our medium-soft mattress. It’s great for side sleepers, and anyone who likes more cushioning while they’re in bed. We combine our proprietary, cooling Bio-Pur™ foam and Affinity with SMT comfort foam layers to create a soft but responsive feel that relieves pressure points and makes you feel like you’re floating. Plus the high-performance Celliant® cover is made with thermoreactive yarn to safely turn body heat into infrared. Your comfort is guaranteed.

Profile height: 12-inch Feel: Medium Soft
Size
Price
$1699 $1499 with promo
Save $200.00
Due to high demand, all mattresses will ship in 2-3 weeks
 

Wonderful bed!!

My husband and I have both noticed a reduction in back pain and better overall sleep.

By 

from Phoenix AZ

About Me Midrange Shopper

 

LOVE THIS MATTRESS

Fast Shipping Customer Service was great! Loving this new bed!! I purchased the whole set up mattress frame pillows and mattress topper....Worth the money!!

By 

from Greensboro NC

About Me Midrange Shopper

All featured customer reviews are unaltered and verified by PowerReviews (view disclaimer).

No mattress is more carefully engineered.
  • For Back & Stomach Sleepers

  • For Side & Combo Sleepers

  • AS1

    Formerly Americana

    Firm

  • AS2

    Formerly Revere

    Medium Firm

  • AS3

    Formerly Liberty

    Medium

  • AS4

    Formerly Colonial

    Medium Soft

  • AS5

    Formerly Independence

    Soft

Too firm:
Pressure Points

(Futon mattress)

Too soft:
No support

(Pillow top mattress)

High-Performance Celliant® Cover

Celliant® is an advanced fabric made with 13 thermoreactive minerals that helps improve the performance of the mattress.

Extra-Breathable cooling layer

Our Bio-Pur™ foam is five times more breathable than traditional memory foam, because of it’s advanced open-cell structure. It wicks away heat while you sleep and can help keep you cool and comfortable.

Enhanced "Feels-like-you're-floating" layer

The Affinity layer with Surface Modification Technology (SMT) is our ergonomic transition foam. It has “zones” that provide extra pressure relief in key areas like the shoulders and lower back, along with precision-cut channels that carry away even more heat and moisture. It’s enough to make you feel like you're weightlessly resting on a cloud.

Sag-free & Eco-friendly Support

Our Bio-Core™ foam support layer won't sag even after decades of use. And, like our Bio-Pur™ foam, it’s partially made from plants instead of petroleum so it’s eco-friendly.

Tested to get you more sleep.

Amerisleep mattresses are expertly designed to help you get more sleep — guaranteed. Our mattresses are built with performance in mind down to the last detail. That even includes the cover, which is a critical part of a mattress because it's the layer closest to your body when you sleep.

Amerisleep is officially licensed to use Celliant® in our covers. This advanced fabric combines 13 minerals into thermoreactive yarn that converts body heat into infrared.

We created a superior memory foam that helps keep you cool.

Traditional memory foam is made from dense material, so it traps your body heat and can make you sweaty and uncomfortable while you’re in bed — and who can sleep like that?

We developed our foam with an enhanced "open cell structure," which means there is more air space between the foam particles. That space wicks away heat while you sleep, and can keep you cooler and more comfortable. Remember, you have 100 nights to try it for yourself - if you don't love it, give us a call and we'll pick up the mattress and refund you completely!

On top of that, our foam is also the most environmentally friendly. Our patented foam-making process uses plants to replace some petroleum, and is the only manufacturing method that exceeds the standards of the Clean Air Act.

More comfort. Less “stuck”.

Our foam is also better than traditional memory foam because it recovers its shape faster. With a typical foam mattress, you often wind up “stuck” when you change positions but the mattress is still holding your previous shape. That’s because it takes around 60 seconds for the foam to bounce back.

Ours bounces back in just four seconds, so as you move at night your mattress keeps up with you, providing superior comfort.

 

Super Comfy!

I'm getting the best sleep ever! My Fitbit tracker shows my awake and restless times were cut in half.

By 

from Chandler AZ

About Me Midrange Shopper

 

Most Comfortable Bed Ever

I sleep on this bed every night and it is very comfortable. plus..it is made in America! Would order more products from Amerisleep and highly recommend to others.

By 

from Albany New Yor

About Me Midrange Shopper

All featured customer reviews are unaltered and verified by PowerReviews (view disclaimer).

Use it on any frame you want (even none!)
Directly on the floor

No furniture, no problem. You can put your Amerisleep mattress directly on the floor.

Box Spring

If you want to use your existing box spring, place a piece of 3/4” moisture resistant plywood directly on top.

Flat or slatted frame

A flat platform will work perfectly, so long as the gaps between the slats are no more than three inches apart.

Adjustable Base

Adding an adjustable base can elevate your comfort, allowing you to read or watch tv in bed.

What would you do with more energy
and less pain?

Imagine waking up each morning with no pain and increased energy. How would that change the way you approach your day? Would you finally be able exercise regularly? Would you be able to perform better at work instead of constantly feeling groggy and needing another cup of coffee?

Sleep quality is so important because we spend about a third of our lives in bed!

That means, besides our jobs and our families, our sleep probably has the biggest impact in our quality of life. The number of daily problems that go away with a good night’s sleep is astounding — but that only happens if you actually do something to improve your sleep.

If you just keep things the same, you’ll keep getting the same disappointing results. And don’t you deseve better?

 

Awesome

By 

from Reno NV

About Me Midrange Shopper

 

Extremely comfortable

By 

from CA

About Me Midrange Shopper

 

Wish we had this bed 10 years ago!

By 

from VT

About Me Midrange Shopper

 

Geat quality

By 

from Campbellsville

About Me Midrange Shopper

All featured customer reviews are unaltered and verified by PowerReviews (view disclaimer).

100 Night Trial, Free Returns
Learn more about our 100 Night Sleep Trial
Sleep Trial & Warranty Information
Back to Front
 

very comfortable

This mattress is used on our spilt-king adjustable frame and it feels very good.Most of the time when I go to bed at night I watch TV for an hour but I fall asleep with in ten minutes. The mattress is not too firm but just right and I get a good night sleep. I looked at many mattress and and I glad I choose the colonial mattress from amerisleep.

By 

from St.Augustine Fl

About Me Midrange Shopper

All featured customer reviews are unaltered and verified by PowerReviews (view disclaimer).

We use more eco-friendly memory foams.
Yet another way we’re better.

Amerisleep is one of the most eco-friendly mattress companies. From the way we make our foam all the way through how it arrives at your door, we work hard to use processes that are sustainable — literally from start to finish.

First, our patented Variable Pressure Foaming (VPF) process allows us to use plant-based materials to replace some petroleum, so it's better for the environment. It also reclaims and recycles any waste, so there is no air pollution. It's the only process for making foam that meets the Clean Air Act's standards.

Once we've made your mattress, we pack it up in a box made from post-consumer materials before shipping it to your door. Being more eco-friendly is just one more thing that makes our mattresses different than our competitors.

Plant-based
Formula

Zero emissions
manufacturing

eco-box
delivery

Fast, Easy & Free Shipping

Your mattress ships to you compressed in an eco-friendly box small enough that we can use FedEx. That means it gets to you quickly, usually within a week of your purchase!

 

This is an incredibly comfortable mattress. Worth every dime

Except for my occasional bouts of insomnia I'm enjoying the best sleep of my life due vastly to this mattress

By 

from Medford OR

About Me Midrange Shopper

 

This is our 4th Mattress!

Amazing product and very happy with the quality of the Colonial bed. Recommend it!

By 

from Gilbert Az

About Me Midrange Shopper

All featured customer reviews are unaltered and verified by PowerReviews (view disclaimer).

See what our customers have to say -
don't you wish you slept this good?

All featured customer reviews are unaltered and verified by PowerReviews (view disclaimer).

REVIEW SNAPSHOT®

by PowerReviews
Plush Memory Foam Twin XL AS4 Mattress by Amerisleep - 13" x 38" x 80"
 
4.7

(based on 476 reviews)

Ratings Distribution

  • 5 Stars

     

    (362)

  • 4 Stars

     

    (92)

  • 3 Stars

     

    (17)

  • 2 Stars

     

    (3)

  • 1 Stars

     

    (2)

98%

of respondents would recommend this to a friend.

Pros

  • Comfortable (429)
  • Good support (414)
  • Holds shape (353)
  • Soft feel (333)
  • Durable (270)

Cons

  • Too hard (49)
  • Too soft (12)
  • Develops cavity (11)

Best Uses

  • Primary bed (458)
  • Guest bed (31)
    • Reviewer Profile:
    • Midrange shopper (327), High-end shopper (96), Budget shopper (40)

Reviewed by 476 customers

Displaying reviews 1-10

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5.0

Comfortable Yet Supportive

By 

from Portland OR

About Me Midrange Shopper

Verified Buyer

Pros

  • Comfortable
  • Good Support
  • Soft Feel

Cons

    Best Uses

    • Primary Bed

    Comments about Plush Memory Foam Twin XL AS4 Mattress by Amerisleep - 13" x 38" x 80":

    We were sleeping on a queen-sized Tempur-Pedic bed, but wanted to switch to a king-sized bed. We like the feel of a memory foam mattress, but my husband felt our bed was too firm for a side sleeper (it hurt his hips), and that he slept too hot on our current bed. I started looking at other memory foam options and liked the reviews for Amerisleep products. We also liked the idea of a more eco-friendly product, so we ordered the AS4 (formerly Colonial). The AS4 was marketed as a good choice for side sleepers and it seems to be. We've slept great since the first night. The bed is comfortable, soft enough, firm enough, and sleeps cooler than our previous mattress. There was no mattress odor to contend with and, so far, we love this bed. We have been sleeping on the mattress for about a month, so we cannot yet speak to durability, but right now we feel we've made a great purchase.

     
    5.0

    Best Sleep

    By 

    from Wheeling WV

    About Me Midrange Shopper

    Verified Buyer

    Pros

    • Comfortable
    • Good Support
    • Holds Shape
    • Soft Feel
    • Sturdy

    Cons

      Best Uses

      • Primary Bed

      Comments about Plush Memory Foam Twin XL AS4 Mattress by Amerisleep - 13" x 38" x 80":

      AS3 & 4. Split King. Best move ever

       
      5.0

      It's the best i've slept in 10 years!

      By 

      from Davenport,Iowa

      About Me Midrange Shopper

      Verified Buyer

      Pros

      • Comfortable
      • Feels expensive, very well made
      • Good Support
      • Holds Shape
      • Soft Feel
      • Sturdy

      Cons

        Best Uses

        • Primary Bed

        Comments about Plush Memory Foam Twin XL AS4 Mattress by Amerisleep - 13" x 38" x 80":

        It was easy to order, the online help was fantastic. It shipped very quickly and arrived with no issues. Was sleeping on it just a couple of hours later. No smell or odor typically found with other foam mattresses. Been on it for a little over a month and would never return it. Love it, Love it, Love it!

         
        5.0

        I recommend this mattress to everyone

        By 

        from whipple, oh

        About Me Budget Shopper

        Verified Reviewer

        Pros

        • Comfortable
        • Good Support
        • Holds Shape
        • keeps most night sweats at bay
        • Soft Feel
        • Sturdy

        Cons

          Best Uses

          • Primary Bed

          Comments about Plush Memory Foam Twin XL AS4 Mattress by Amerisleep - 13" x 38" x 80":

          Hubby and I have used this mattress for over a year now and still wouldn't exchange it for another. We have slept better and have less aches and pains since it arrived. It has kept me cooler than our last bed.

           
          5.0

          I love my AS4 #sweepstakes

          By 

          from Austin, TX

          About Me Midrange Shopper

          Verified Buyer

          Pros

          • Comfortable
          • Good Support
          • Soft Feel

          Cons

            Best Uses

            • Primary Bed

            Comments about Plush Memory Foam Twin XL AS4 Mattress by Amerisleep - 13" x 38" x 80":

            I am so happy with my AS4 mattress! I trialed the Liberty mattress and it was slightly too firm for me. I had such a positive customer service experience with my return and was impressed by the company and mattress quality so I decided to order the next softer Amerisleep model. I am blown away by how much better I am sleeping in the AS4! The mattress feels very supportive but slightly softer and more conforming to my body. I have been sleeping soundly through the night and have not been tossing and turning. My joints also feel better. The memory foam is responsive but also gives me the "sinking in" feeling I love about memory foam. Anecdotally, I recently had a surgery and apparently all I talked about after waking up from anesthesia was how excited I was to sleep in my Amerisleep mattress. #sweepstakes

             
            5.0

            Would buy this product again

            By 

            from Corpus Christi, TX

            About Me Midrange Shopper

            Verified Buyer

            Pros

            • Comfortable
            • Good Support
            • Holds Shape
            • Soft Feel
            • Sturdy

            Cons

              Best Uses

              • Primary Bed

              Comments about Plush Memory Foam Twin XL AS4 Mattress by Amerisleep - 13" x 38" x 80":

              Simple purchasing process, arrived on time, easy to set up, very comfortable and durable! Would purchase again and have told several friends about it!

               
              5.0

              Returned bed but great customer service

              By 

              from Phoenix. Az

              About Me Midrange Shopper

              Verified Buyer

              Pros

                Cons

                • Too Soft

                Best Uses

                • Primary Bed

                Comments about Plush Memory Foam Twin XL AS4 Mattress by Amerisleep - 13" x 38" x 80":

                We returned the mattress but still would recommend amerisleep because of their great customer service.

                Service and delivery comments:

                Great customer service. Everything from purchase to return was easy. Trevor Kuhles, customer service, was fast and easy to deal with.

                (1 of 1 customers found this review helpful)

                 
                4.0

                Good mattress, but we returned it

                By 

                from Tulsa, OK

                Verified Buyer

                Pros

                • Good Support
                • Holds Shape
                • Sturdy

                Cons

                • Too Hard

                Best Uses

                  Comments about Plush Memory Foam Twin XL AS4 Mattress by Amerisleep - 13" x 38" x 80":

                  We bought the Colonial king sized mattress earlier this year. It was easy to set up. My husband had wanted to replace our softside waterbed with a regular mattress. We were both so used to sinking into the softside waterbed and we didn't predict what the difference would be. As long as I slept on my side, I was fine. But I'm primarily a back sleeper. My husband and I both woke with stiff backs. I haven't yet found a mattress that feels as good as the softside waterbed. I was pleased that when we contacted Amerisleep, they had the mattress picked up at our house, and we got a full refund within a few days. Good company.

                  (1 of 1 customers found this review helpful)

                   
                  3.0

                  Too soft for me

                  By 

                  from Denver CO

                  About Me Midrange Shopper

                  Verified Buyer

                  Pros

                  • Comfortable
                  • Soft Feel

                  Cons

                  • Too Soft

                  Best Uses

                    Comments about Plush Memory Foam Twin XL AS4 Mattress by Amerisleep - 13" x 38" x 80":

                    My old bed was really firm, and I never liked it. I'm a side sleeper, and I felt like I was sleeping on the floor. I Iike a soft feel, so I figured I'd start soft in my new bed search. But, like Goldilocks, my first bed was too hard, and this second one was too soft. I could have lived with it, but it just wasn't ideal. I also decided that I don't love the pure memory foam feel. I like a little bounce in my bed. So I returned it and went with a hybrid from a different mattress company. But Amerisleep was great through the whole thing. If you like a really soft bed, you'll love this one.

                    Service and delivery comments:

                    Everything with delivery and pickup was great.

                    (1 of 1 customers found this review helpful)

                     
                    4.0

                    Comfortable!

                    By 

                    from Seattle, WA

                    About Me High-end Shopper

                    Verified Buyer

                    Pros

                    • Comfortable
                    • Good Support
                    • Sturdy

                    Cons

                      Best Uses

                      • Guest Bed
                      • Primary Bed

                      Comments about Plush Memory Foam Twin XL AS4 Mattress by Amerisleep - 13" x 38" x 80":

                      This bed is firmer than I expected, but it conforms in a way that is supportive, yet comfortable. I require a soft bed as I am prone to getting hip bursitis from firm mattresses. I thought this mattress was too firm initially, however, it conforms to your body so nicely that I have had no issues at all. I haven't been sore when waking up and have found it to be quite comfortable despite the bed being firmer than expected. This bed does sleep hot, unfortunately, despite the "cooling" technology. I wake up in a sweat sometimes, so that is the only reason I gave it 4 stars instead of 5. The edge of the bed firmness is better than most bed in a box types, and I haven't had any issue with it. Overall, it's a pretty great bed and I am very pleased with this purchase!

                      Service and delivery comments:

                      Product arrived with one of the handles on the box broken off, but it wasn't really an issue. It didn't come with any sort of device to cut the plastic, but I had something that easily cut it, so that wasn't a problem either. It was simple to set up the bed and was ready to use after a few hours.

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                      *Reviews

                      All featured customer reviews are unaltered and verified by PowerReviews. The comments made by customers are not intended as advertisements, and should be understood as the perspective of each individual based on their experience. These reviews should not be construed to mean that these experiences are universal or that results will always be the same.