600TC Cotton CinchFit Sheets For Adjustable Beds

Our Cotton 600TC CinchFit Sheets For Adjustable Beds are made of beautiful, quality material and our CinchFit design that will cinch to fit your mattress perfectly every time.



Our Cotton 600TC CinchFit Sheets For Adjustable Beds are made of beautiful, quality material and our CinchFit design that will cinch to fit your mattress perfectly every time. Single Ply 600 Thread Count 100% Combed Cotton. This fabric is elegant yet durable. 

Our CinchFit Fitted Sheet design is perfect for Adjustable Beds and our fitted sheet design makes sure the sheets stay on! For Adjustable Split Flex Top Beds, our FlexSquare reinforcement prevents tears in the flex center. This sheet set is constructed from 100% long staple cotton sateen woven at a 600 thread count per square inch.


  • Cinching Stay On & Adjustable Fitted Sheet Design
  • Directional Tags for ease of bed making
  • FlexSquare reinforcement on split top mattresses
  • A split top fitted sheet design that both fits snug and doesn't rip
  • Fitted sheet can be tightened over time for a snug fit for many years
  • Our fitted sheets will fit up to 15" mattress depths and will cinch to fit smaller mattress depths.

Extra Pillowcase Sets:

Are located HERE!

Split King Adjustable Sheet Sizes:

Split King - (2) Fitted 39" x 80", (1) Flat Sheet 108" x 102", (2) 20" x 40" Pillow Cases
Split Cal King - (2) Fitted 36" x 84",(1) Flat Sheet 108" x 102", (2) 20" x 40" Pillow Cases 

Split Flex Top Queen & Split Flex Top King Adjustable Sheet Sizes:

Split Flex Top Queen - (1) Fitted Queen With Split Top, (1) Flat Sheet 90" x 102", (2) 20" x 30" Pillow Cases 
Split Flex Top King - (1) Fitted King With Split Top, (1) Flat Sheet 108" x 102", (2) 20" x 40" Pillow Cases 
Split Flex Top Cal King - (1) Fitted Cal King With Split Top, (1) Flat Sheet 108" x 102", (2) 20" x 40" Pillow Cases 

Special Features of our Flex Top Sheets: 

Our Split Flex Fitted Sheet design is the only design that doesn't rip and fits snugly on adjustable mattresses. Designed and created by us in 2016 and using the principles of sail repair, our FlexSquare reinforcement prevents our sheets from ripping in the flex center. We also use a stretchable, white jersey material in the center boxing area for added flexibility to prevent tears.  Our Flex Top Fitted Sheets are made to fit splits of 35" from the head. With our flexible jersey material in the flex center, they can accommodate many different split lengths.

Care Instructions: 

Machine wash in cold water delicate cycle with mild detergent. No Bleach. Tumble dry on low heat. Remove immediately at end of cycle. Press with warm iron if needed. Do Not Was in Hot Water. Do Not Wash with Heavy Load. More detailed information on "Keeping Your Sheets Looking As Good As New" can be found HERE.

Folding Your Sheets: 

Once you receive your sheets, be sure to check out our how to videos on how to fold your fitted sheet HERE.

Additional information

Weight 3 lbs
Dimensions 14 × 12 × 4 in
600TC Cotton Color Options

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600TC Cotton Sizes Home

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50 reviews for 600TC Cotton CinchFit Sheets For Adjustable Beds

  1. Frederick Dobras (verified owner)

  2. Angela (verified owner)

  3. Cynthia Hebert (verified owner)

    Fit our split top king size sleep number bed perfectly. Your sheets fit our split top king size sleep number bed perfectly. We were having trouble finding sheets that fit our bed. So I am so glad we found your website. They are so very comfortable and look so nice!!

  4. William B (verified owner)

    Delighted with Split King Sheet Set. Received my Split King Sheet set last week and am delighted to report that they fit like a charm. I loved the elastic banding around the bottom sheet and not having a actual split down the top is a great feature. It was so much easier to make up the bed. I will never buy another Sleep Number sheet set again.
    My only desire would be to have a sheet available with a hight thread count. I researched on line and could not find anyone above a 750 which was very surprising to me. If you can afford to buy a $10,000 mattress you should be able to afford to buy a high quality sheet regardless of the cost.
    In any event you have won over a new customer and I am looking forward to doing business with you in the future. You workmanship is outstanding and the product exceeded my expectations.

  5. J Monza (verified owner)

    Great sheets for a flex top split king. Bought the 600ct sheet set for a flex top King mattress that we have. They are well made and fit great.

  6. Linda devries

    the best fit for flex split. I own a split flex king bed and these sheets are the absolute best for this bed. I have gotten a few and never disappointed.

  7. Michelle (verified owner)

    Perfect fit & great quality. We purchased a sleep number bed and I passed on purchasing sheets from their store. The material was thin and felt slick. I searched the Internet for the split/top style and found the sheets were basically all the same made from a micro material. I was thrilled to find Quahog Bay Bedding has 600 count cotton. They feel like traditional cotton sheets and do not slip off. We love them❤️

  8. Marij321

    Split King Sheet Set. I have long purchased quality sheets for our split king adjustable bed. The past company I bought from sold good quality sheets but they do tear after somewhat over a year’s use. I decided to try a new company and chose Qayhog Bay. We received our sheets and I am stunned at the high quality of cotton/bamboo used in our set. It’s so gorgeous and soft and comfortable. I am going to order a second set soon. I wish I could give you a ten star. I most highly recommend these sheets and this company. They are custom made so take a bit to get them but the wait is positively worth it. This is one GREAT company!

  9. Melissa

    Love These Sheets. These sheets feel great and fit our split top king better than the manufacturer sheets. Will be purchasing more. Don’t hesitate, these are good quality which I expect will last a very long time. This is our 2nd purchase from Quahog Bay.

  10. Rebecca M LeBlanc

    Great for split-flex top mattresses. After spending too much $$ on sheets from the bed manufacturer that continued to rip @ the flex-top – I found Quahog Bay Bedding – we now own 3 sets as they recently had a great sale and I never want to be without these sheets again! Wonderful fabric and their flex-design took care of the splitting issue! Love their stuff!

  11. Rebecca M LeBlanc

    Great for split flex-top mattresses. After spending hundreds of dollars on fitted sheets for our flex-top mattress that would become shredded as my hubby needs to have his side “raised” to wipe out the snoring – we found your bedding and the design of the fitted sheets is terrific! Just purchased a second/third set (sale!) as it’s good to have a back up set! The fitted sheet is still going strong after a year of 3 cats, 1 dog, 1 very loud snorer and me, the lady who washes it twice/week! Thanks so much!

  12. Customer (verified owner)

    Cinch fit sheets. I love the bamboo cinch fit split king sheets I purchased in the past. They are so light and cool for summer and I loved the cinch fit that kept the bottom sheets from popping off the adjustable bed when it is raised. When I had the extra to purchase another set, I was dismayed to learn they had stopped making the bamboo sheets for a split king bed. They said they would custom make them but the price is WAY to high for me. When they were on sale I had also bought the 300 count cotton split king sheets in Navy and they are nice. Not a big fan of all cotton sheets as it does get hot but the 300 count is lighter then 600 count. I wanted another set of light colored sheets and tried to get light blue in the 300 count cotton, but again they didn’t have them, so I purchased a set in white that was on sale. Now I see there are no 300 count cotton sheets offered.

  13. Customer

    Quahog Bay Bedding. just purchased another set of their sheets. I will not buy sheets from any other company. Not only are the sheets great but so is their customer service. We have a split top king and found out the hard way that the material used in the split wears out or rips in other brands. Not in the ones from Quahog Bay. They are so well constructed and the sheets feel fabulous. We purchased the 600TC. I highly recommend Quahog Bay Bedding.

  14. Customer

    We purchased a Split Top Sleep Number Bed along were their sheets. Quite honestly Sleep Number’s sheets don’t compare with the quality and weight of Quahog Bay Sheets. We are so happy that we found your website, and so happy that we ordered two sets!

  15. Customer

    Buying More. These sheets are very comfortable, reasonably priced and made in the USA! We have the split king and have tried multiple other types, including bamboo, and the Quahog sheets surpass all others. Am buying more for the other beds.

  16. Customer

    Great Bedding. It’s not easy finding quality sheets for a Flex King Bed. These sheets are the absolute best. Soft, well-made and fast delivery. I had a minor issue with a top sheet and the correction was swift and without hassle. Highly recommend.

  17. J Marino

    hese sheets are well made, sturdy and very soft against the skin. We found these after we bought a split-king Sleep # Bed. We didn’t like the quality of the sheets at the Sleep # bed store. So googled for sheets that would work on our bed; read great reviews and ordered them. They arrived quickly. We are very pleased with them.


    the sheets are very well made but the string loosens up and then they come off the bed so that is very frustrating

  19. VB (verified owner)

    These are the best sheets! I’ve purchased other, more expensive, fitted split flex king sheets that tore easily with no recourse. The manufacturer told me that I needed to purchase again – the definition of insanity! From now on, Quaghog is my destination for bed linens. Superior quality, great price and fantastic customer service!

  20. Beverly (Orlando, FL)

    Absolutely love the splix flex king fitted sheet that I bought! I received it pretty quick and the quality is outstanding! Not like cheap store bought sheets. The sheet seems thicker and works great on our adjustable bed. The price I thought is very reasonable also. Will definitely be purchasing more sheets from here. This is one of the few that I can actually purchase these type of sheets from. 🙂

  21. Cynthia Spaulding

    Just the best split top sheets on the market.

  22. Shirley Kline

    Truly FITTED sheets. Nothing like truly FITTED sheets. These sheets can be fitted as tightly as you would like them. You could literally “bounce a dime” off of them if you so choose to. Great quality. Have 2 sets and love them.

  23. Bonnie Watts

    This is some of the best betting I’ve…This is some of the best bedding I’ve ever purchased. I just love it

  24. Sharon Ciessau-Atcher

    The split king sheets are so wonderful on my sleep number bed. The 600 count set are getting softer with every wash, but still feel strong. Per the instructions I’ve used woolite and a small amount of Downey on the delicate cycle. The single fitted option is also a godsend after the sheets sold by sleep number tore terribly. Thankful for this option to retain the used of the rest of the set. But from now on, I’ll be staying with Quahog Bay for future set purchases, especially with the lifetime guarantee. My only hope is that the 600 count split king will be offered in more colors in the future. I love white, but some other choices would be a bonus. I will promote these sheets as a sleep number owner alternative, so hopefully the market will grow and the company can expand their offerings.

  25. William Felton

    We have bought 2 sets of Flex King Sheets for our Sleep Number bed and they have been outstanding! Far superior in quality than the costly sheets from Sleep Number. I highly recommend Quahog Bay!

  26. Dreaming in Doylestown

    Can’t say enough about these sheets! We bought split top king for our sleep number bed. They are beautiful quality, so comfortable, and arrived very quickly. Love love love!

  27. customer Peggy

    Most comfortable sheets and fit is amazing!

  28. MS in Lees Summit, MO

    The quality of their sheets is impressive and they arrived quickly!

  29. Customer

    This companies customer service is excellent. I have a replacement split bottom sheet and mattress cover to replace my old Sleep Number set. The old set ripped and came apart. I can tell that the fabric and workmanship on the Quahog is superior. Haven’t had the replacement long enough to test durability.

  30. Cynthia

    We have a split flex top california king and these are the first sheets that do not tear in the crotch and have a decent thread count. 600. Would like to see them in a higher thread count; but they fit and are really superior to anything we have been able to find.

  31. Janice Duke

    Received quickly. Sheet fit great and feels great!! Thank you for such a quality product!!!!!

  32. Amanda

    Fast shipping and FINALLY a quality sheet for my flex top bed that is sew correctly with the correct materials and should not RIP! Beyond happy with this company and product.

  33. Customer

    Absolutely love these sheets, especially the reinforced area at the bottom of the split top mattress. These have definitely held up better than ones I’ve purchased from Sleep Number.

  34. Gary C

    Nice sheets, looks to be good quality, fast service

  35. Noel

    Great new sheets! We just put our new sheets on our split king adjustable base bed, and we are delighted! The sheets are lovely, and the drawstring fitted sheets make putting them on the mattresses so much easier than with the regular fitted sheets we had been using. Thank you so much for thinking of this great idea.

  36. Customer

    We have only washed them once. They are soft

  37. Arayasonshine X2

    Very satisfied with the products I have … Very satisfied with the products I have purchased over the years. Colors stay vivid, drawstring elastic base sheets hold tight even with adjustable base bedding frames. Good idea for the laundry protective pouch for the draw strings. I much prefer the increased thread count cotton sheets for their texture and durability. My guests compliment the sheets for their comfort.

  38. Lou-Ann

    Better than Sleep Number by far! These sheets were great for my Sleep Number mattress. Thank you soooo much for such high quality sheets. We love them.

  39. Shelley

    I like the fabric of the sheets. Nice and crisp. But unfortunately they aren’t as deep as our adjustable air mattress so even with the adjustment they pop off the corners.

  40. Myra

    This company is awesome. There were quality issues on first order and they made it right! Totally trustworthy and I will order again.

  41. Brian

    Great fit and quality. Only one washing but I can tell the quality of these sheets are much higher than the ones I’ve been using. I really like the snug fit. My other sheets are Royal Traditions which are good, they don’t fit as snug but they are also much less expensive. I’m using the Split Head King size for a Reverie DreamTop mattress.

  42. Patrick Belland

    cinch-guard bedding. We recently purchased new bedroom suites. The king split-matress adjustable bed has very thick mattresses (22″ thick). Finding linen for these mattresses that would stay on when the bed was raised or otherwise adjusted was next to impossible until I found Quahog Bay bedding on-line. Their sinch-guard bedding in wonderful and very easy to care for. I highly recommend their bedding products to everyone. After trying one set, I have purchased two more sets, and plan to buy more.

  43. Shara

    Always fast response, good customer service, great quality, prompt delivery.

  44. Penny

    Very comfortable and soft sheets. Sturdy as well. Has maintained color and shape through many washes. Highly recommend.

  45. Barbara

    Love love love these sheets – just wish there were more colors!

  46. Connie

    These are really nice sheets. They wash well and fabric feels soft. We have a split king and this set works great.

  47. Deborah

    The bottom sheet never did fit the … The bottom sheet never did fit the split top sleep number bed properly (sleep number fits better). After washing and following directions it falls even shorter on sides and top to bottom than the Sleep Number sheets. I only used the Quahog sheets 4 times in a year, rather put up with the sheets I bought from Sleep Number! If you own a Sleep Number bed, Split Top Adjustable king, stay with Sleep number sheets, they are better while not perfect!!

  48. Carolyn

    Processing time prolonged. It took a long time between ordering and receiving my sheets. Not sure why. I like the sheets so may order another set.

  49. Teresa

    Excellent product, a little pricey.

  50. Ellen

    Overall very good – one issue. Service is great, the materials are well made and very comfortable. My only complaint is that the split part of the sheets does not fit as well as it needs to on the split king.

Only logged in customers who have purchased this product may leave a review.

Size Fitted Sheet Flat Sheet Pillowcases Mattress Depths
Split King 39 x 80 (2) 110 x 102 20 x 40 Up To 15 Inches
Split Cal King 39 x 84 (2) 110 x 102 20 x 40 Up To 15 Inches
Split Top Queen 60 x 80 (35 Split) 90 x 102 20 x 30 Up To 15 Inches
Split Top King 78 x 80 (35 Split) 110 x 102 20 x 40 Up To 15 Inches
Split Top Cal King 72 84 (35 Split) 110 x 102 20 x 40 Up To 15 Inches

We ship free to the continental US! All CinchFit Sheets are currently on SALE!

Size Fitted Sheet Flat Sheet Pillowcases Mattress Depths
Split King 39 x 80 (2) 110 x 102 20 x 40 Up To 15 Inches
Split Cal King 39 x 84 (2) 110 x 102 20 x 40 Up To 15 Inches
Split Top Queen 60 x 80 (35 Split) 90 x 102 20 x 30 Up To 15 Inches
Split Top King 78 x 80 (35 Split) 110 x 102 20 x 40 Up To 15 Inches
Split Top Cal King 72 84 (35 Split) 110 x 102 20 x 40 Up To 15 Inches