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OSO Mattress

OSO Mattress


Not all foams are created equal


Latex Layer

1.5’’ of premium Talalay latex goes through a careful washing process so it won’t irritate sensitive skin. Plus, it’s naturally hypoallergenic, dust-mite resistant, and free of harmful chemical emissions.

Float Layer

1.5’’ of RevTechTM foam sets you up to float into dreamland. This layer is designed in tandem with the top latex layer to be breathable, cool, and promote air flow.

DreamCell™ Foam Springs

More durable than spring coils and the secret sauce to the comfort of OSO mattresses, our dream cells are crafted from pillowy latex for high durability and comfort.

RevTech™ Foam

Many foams are unfortunately a source of harmful chemicals, but our 6’’ RevTech™ support layer is free of heavy metals, formaldehydes, VOCs, and without dangerous off-gassing.

Top Knit

This impossibly soft gray waterfall cover zips off and can be dry cleaned.


Change your mind as often as you want

The OSO mattress stands out from the crowd because we give you both a soft and firm option in the same bed. Since your pressure points are concentrated in between your shoulders and hips, we zero in on the support in those areas. Simply rotate the bed 180 degrees to find your preference.

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Product Details

Size & Dimensions

38" x 74" x 9" (35 lbs)

38" x 80" x 9" (38 lbs)

54" x 74" x 9" (50 lbs)

59" x 80" x 9" (59 lbs)

76" x 80" x 9" (76 lbs)

72" x 84" x 9" (76 lbs)

Materials & Construction

  • We are committed to maintaining a 2 lb density or higher in our foams to ensure durability.
  • Fabric made in South Carolina.
  • 1.5” of premium Talalay latex with a 14-16 ILD range and 3 lb density, made in the USA.
  • 1.5” of 2 lb pcf foam, made in the USA.
  • 6” of 2 lb pcf RevTech foam made in the USA.
  • DreamCell foam springs have 4 and 5 lb natural latex


We think the USA makes great materials for beds—that’s why we design, create, and manufacture from our offices and manufacturing facilities in Michigan, New York, and Massachusetts.


  • Q: How cool is this mattress?
  • A: This mattress is designed to promote optimal temperature regulation, and that includes lots of breathability—which means a cool sleep!
  • Q: Do I need a box spring?
  • A: Nope, you can put this mattress right on the ground if you want. You can also use a slatted bed base, pallets, or even a rigid box spring if you prefer your bed off the ground.
  • Q: Is the bed split left/right or head/foot?
  • A: Head/foot. Just rotate the mattress for a different level of firmness!
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Average Rating:
32 reviews
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Memphis, TN
07:57 PM
What a great mattress!
When my husband and I decided to upgrade to a king bed after 24 years of marriage we opted to do a split king to accommodate our new adjustable bases. We started with another "colorful" brand that is supposed to eliminate pain on sensitive joints- I'm a bit boney and sleeping on my side tends to make my arm fall asleep and causes my hip bone to hurt. My husband was happy with his but I sunk in to the bed so far it made my back hurt (I'm 5'-6" and 120 lbs). Back mine went and I ordered a Twin XL OSO. When I unwrapped it, it had almost no smell and it broke in remarkably quick- maybe in a day or so. Now, I'm so spoiled by this mattress that when we travel I have to pack my thin, lightweight, camping air mattress to make other beds bearable on my lower back and hips. After a year of ownership mine has only gotten better while my husband's "colorful brand" has started loosing it's shape and support.
I absolutely LOVE this mattress!
Bozeman MT
11:30 AM
Kathleen Winters
Amazing mattress and Amazing company! I am a professional athlete who competes for TeamUSA and I can't believe the difference this mattress has made in my performance and recovery! If you are looking for a new mattress I highly recommend this one!
Sanford, Fl
09:24 PM
Perfect for my back, amazing customer service
All I can say is: get it and try it. You will love it.
I got the mattress and immediately fell in love with how well it treats my back. I can sleep most of the night on my back, with little to no need to toss and turn. My sleep on this mattress definitely feels more restful, and I don't wake up with as many aches and pains. I had a concern with a seam on the mattress, and the customer service was superb. All my questions and concerns were treated patiently and professionally, and met with outstanding resolutions.
I would not hesitate to recommend this mattress to friends and family. I am happy that they offer such a great return policy, because even though I didn't end up needing to use it, it made getting the mattress feel like a safe decision.
05:45 PM
Finally 8 hrs of sleep!
I have had the OSO queen size mattress for about 3 months now, and I wanted to wait for a few months before rating it. My wife has had back issues for about 15 years and it seems like we have spent thousands of dollars trying to find the right mattress. We have tried every kind of spring mattress and even tried other memory foam mattresses. My wife has not been able to have a decent sleep in a long time often waking achy and tired. When we received the OSO mattress in a box, very neat by the way, I opened it up and let it puff up for a few hours before bedtime. We tried the firm end the first night and found it was a little too firm for my wife, so we rotated the mattress to the soft end. After three weeks of sleeping on the soft end my wife was still waking up with a sore back, which worried us. But, after the three weeks, she started sleeping longer than her usual 5 hours a night. It was gradual, but now she is up to a 8 or 9 hours of sleep a night and she is loving the mattress. I guess she needed to work out the kinks from the previous bad springy mattresses. Based on how my wife is feeling these days, I would highly recommend this mattress.

Thank you OSO for your amazing design!
Seattle, Washington
03:52 AM
Amazing - Simply Amazing
I'll admit it, I was a bit worried about buying my mattress online. I mean, who wouldn't be?? That said, I could not be more pleased. I have had the best three nights of sleep I have had in years, and it's legitimately due to my new mattress. I love the plush/soft side, and my Boston Terrier loves the firm side!

Seriously - thank you for providing an affordable, well-built, non-toxic, comfortable bed.

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