The SONU Comfort Insert
The SONU Comfort Insert
The SONU Comfort Insert
The SONU Comfort Insert
The SONU Comfort Insert
The SONU Comfort Insert
The SONU Comfort Insert
The SONU Comfort Insert
The SONU Comfort Insert
The SONU Comfort Insert
The SONU Comfort Insert
The SONU Comfort Insert
The SONU Comfort Insert
What's Included

Fills In Comfort Channel

Turns one half of the Comfort Channel into a flat mattress by closing the gaps and matching the support of the rest of your SONU.


Versatility For Other Positions

Helps with sitting up in bed if you don't have an adjustable frame, and provides more options for positions other than side sleeping.


Replaces Support Pillows

Switch between your existing Support Pillows, designed for side sleeping, and the Comfort Insert, designed to convert one half or all of your SONU into a flat mattress whenever needed.


Fitted Sheet Compatibility

If you use two Comfort Inserts to fill in the Comfort Channel entirely, you can then use traditional fitted sheets on the SONU mattress.


Smooth and Cooling Cover

Premium breathable material that is removable for easy washing.


1 Year Warranty

Guaranteed high-quality construction that lasts.


Free Shipping

Your order includes shipping to anywhere within the continental U.S.
* Extra charge to ship to Alaska and Hawaii

The SONU Comfort Insert

The SONU Comfort Insert is an accessory that fills in the Comfort Channel, making the SONU Sleep System more akin toΒ a flat mattress, but still with some give for your shoulders. This versatilityΒ can be helpful in many scenarios including couples who sleep differently from one another (e.g. a side sleeper and a back sleeper) and for those who simply prefer less space in the Comfort Channel. The Comfort Insert also functions as a backrest for sitting up in a SONU if you don't have an adjustable foundation. A single Comfort InsertΒ fills in only one side of the Comfort Channel of Queen and King size SONUs, and the entire Channel of a Twin XL.Β So if you'd like to fill in the entire Channel of a Queen or King, please purchase the 2 pack.
Regular price

Buy 2 and get 20% off the second




Only -3 in stock
1x SONU Sheet Set
Buy The Mattress &
Add 2 Deluxe Top Pillows
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2x SONU Deluxe Top Pillows
$258 FREE
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Made For SONU
1 Year Warranty
1 Year Warranty
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Matching Support
On a scale of 1 to 10 the SONU Comfort Insert is a 6.5 in plushness in order to match the rest of the surface of your SONU Sleep System mattress. When the Comfort Insert is in place it is like laying on a flat mattress.
SONU Comfort Insert
Time to Sleep Like Never Before
Watch the videos below to learn how you're about to get the best night's sleep of your life.
Unmatched Side Sleeping Comfort
The SONU Experience
Life with a SONU
Game Changing Innovations
Real Customers, Real Reviews
Shoppers and their reviews verified by
Thank YOU! Best mattress out there.
β€œAfter being a gymnast for 15 years, I haven't felt this much relief from the pain in my shoulders and my hips while sleeping!! Thank you!”
Steph C.
Highly recommended!
β€œCreates the perfect space for your arm if you're a side sleeper. Changed the way I sleep forever.”
Justin S.
β€œSo I actually own one of these. It's AMAZING. Yes it will take you a few weeks to get "used" to it... But that said, you will be AMAZED at how great your shoulders feel in the morning. Just unreal. Like sleep a full 8 hours without waking up type of sleep.”
Jason R.
Buffalo, NY
β€œI have very bad neck and back issues and this mattress is a dream! If you are a side sleeper you will love it and even if you like to sleep on you back you will love it! Very comfortable and totally worth the money!”
Grace L.
β€œi have suffered from shoulder pain while sleeping for several years, i had just about given up... then i saw this bed and decided one last try. i can't begin to explain what it feels like to sleep through an entire night... for the first time in 20 years the first weekend i had it. I'm so impressed with this bed... because what they are making is making a difference in people's lives.”
Crystal G.
Lives up to the hype
β€œThis comfort channel they made is next level. I never imagined that I would be able to put my arm in the mattress. Takes all the pressure off my shoulder, which I so so need. YES”
Kim J.
Highly recommended!
β€œI’m a side sleeper and I used to wake up with a dead feeling arm from lying on it all night. Finally a mattress with a pocket for my arm. I tried all the pillows and even very expensive mattresses in the past, but nothing cured my circulation problems until I got the sonu sleep mattress. I love it!”
Nic D.
Chicago, IL
β€œ...Sonu mattresses are in a league all by themselves. This is the most comfortable bed I have ever slept on. I have no more shoulder pain and numbness. I can now sleep through the night and not wake up in pain. If anyone is even thinking about getting a Sonu sleep system don’t think anymore. Pull that trigger. I 100% gaurentee you will not be disappointed.”
Christopher B.
Frequently Asked Questions
Yes! We produce an accessory called the SONU Comfort Insert that does precisely that. Install the Comfort Insert to fill in one side of the Comfort Channel on Queen and King sizes, and the entire Channel on a Twin XL. Buy the 2 pack to fill in both sides of Queens and Kings.
The SONU Comfort Insert is an accessory that fills in the Comfort Channel, essentially turning the SONU Sleep System into a normal flat mattress. This can be helpful for sitting up in bed if not using an adjustable foundation, or for couples who sleep differently from one another (a side sleeper and a back sleeper, say). A single SONU Comfort Insert fills in only one side of the Comfort Channel of Queen and King size SONUs, and the entire Channel of the Twin XL size. So if you'd like to fill in the entire Channel of a Queen or King, please purchase the 2 pack.
Yes, with the SONU Comfort Insert you can fill in half of the Comfort Channel in order to further customize the mattress to your personal needs.
SONU Comfort Inserts are sized precisely for their corresponding Comfort Channels to ensure a perfect fit.

Twin XL
29.5” x 13.5” x 9.5”

25.5” x 13.5” x 9.5”

33.5” x 13.5” x 9.5”

Cali King
31.5” x 13.5” x 9.5”

All dimensions above are in inches and formatted as follows: Width x Length x Height.
Photo of the SONU Sleep System from the foot of the mattress with light and dark grey fabric on a black background.
Learn about the reasons we created this unique sleep system, how your old mattress falls short, and the game changing benefits that you'll enjoy every day with a SONU.
Read this informative article and others on our blog, Comfort & Slumber, by The SONU Editorial Team.
β€œThe SONU mattress allows for dramatic improvement in ergonomic support, resulting in better sleeping patterns, and an increase in the patient’s comfort and overall wellbeing.”
- Dr. James Hogan
Chiropractic Physician
Los Angeles, California
Read more about Dr. Hogan and how The SONU Sleep System can help you in the same ways as his patients.
Computer rendering of man with glowing red shoulder pain on blue background.
SONU Social
β€œOMG. I'm going to cry with joy!!! I am ordering this NOW!”
Facebook LogoJason R.
β€œThis is the mattress of my dreams. πŸ˜­πŸ˜­β€
Instagram Logo@angelareed05
β€œI need this more than anything I've ever needed”
Facebook LogoStephanie B.
β€œwhoever designed this needs a special place in heaven lol”
Facebook LogoAntuwan C.
β€œMy shoulders start crying tears of joy when i seen this”
Instagram Logo@jondoemrnobody
β€œZach F. the perfect mattress”
Facebook LogoAli F.
β€œI need this!!!!!! My arm hurts or is asleep every morning!!!!”
Facebook LogoRachel S.
β€œJake - Game changer! πŸ˜³πŸ˜β€
Facebook LogoLewis E.
β€œ@marc.munoz.77 Finally something for folks with broad shoulders who want to sleep on the side.”
Instagram Logo@mechkitten
β€œGenius. Seriously what I've wanted.”
Facebook LogoHailey M.
β€œOmg what a great idea. Now I can sleep on my belly without my arms all weird under me πŸ€£β€
Facebook LogoKrissie S.
Made In The U.S.A.
Image of the red, white and blue U.S. flag
The SONU Sleep System was designed and developed in California, and is manufactured only in the United States - made with the highest quality materials and attention to detail for side sleepers everywhere.
* The SONU Sheets, Support Pillowcases and Mattress Protectors are imported products. All other SONU products are made in the United States.
Designed To Work Together
The SONU Sleep System

It is finally time to immerse into comfort, and sleep like never before.

The SONU Sheets

Soft, cooling and sustainable, with the Comfort Channel built in to fit your SONU.

The SONU Top Pillow Deluxe

The perfect amount of support and malleability to complement your SONU.

Try For 100 Nights

If the SONU Sleep System somehow isn't for you, let us know and we'll come and get it.

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  • In-Home Trial Period

  • Hassle-Free Returns