Split Flex Top King Flannel Sheets - Adjustable Bed Sheets That Stay On
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Looking for Split Flex Top King flannel sheets for your adjustable bed? Adjustable bed sheets that fit tight, stay on, and don't tear down the middle after a few washes?
Flannel season is the hardest time of year to shop for a split top or flex top mattress. Plenty of companies make a warm flannel sheet. Very few make adjustable bed sheets that survive a base that moves every night. Our CinchFit Split Flex Top King flannel sheets are hand sewn in the USA and built for exactly that.
Why flannel is harder to get right on an adjustable bed
Flannel is a heavier, brushed cotton, so it has less give than a percale or jersey sheet. On a split flex top mattress, that extra stiffness goes straight to the split in the middle. When the head of the bed raises, standard flannel adjustable bed sheets either pop off the corners or tear at the bottom of the flex center.
Our design solves both problems. The flex center is sewn from flexible jersey knit material so it stretches as the bed articulates, and it is backed with a reinforcement patch at the stress point where other sheets fail. Because the center panel stretches, one sheet fits every split length.
How CinchFit adjustable bed sheets fit tight and stay on
Every CinchFit fitted sheet uses two types of elastic, 360 degrees around the sheet. Braided elastic gathers the hem, and a strong cord elastic runs through a casing and exits the sheet at a cord lock. You cinch it down for a drum tight fit, or loosen it to strip the bed on laundry day. A small storage pocket holds the extra cording so it doesn't tangle in the wash.
The part customers tell us they didn't expect: you can re-tighten the sheet months later. All fabric relaxes with use. Most fitted sheets get baggy and there is nothing you can do about it. These you just pull snug again.
The same cord elastic is why these sheets conform to odd shaped mattresses, including boat berths and shallow mattresses that standard sheets swim on.
Split Flex Top King sizes and depths
We sew our flannel sheets in 15 inch deep pockets that cinch down to fit smaller depths perfectly, and in a 9 inch shallow pocket version for thinner mattresses. Beyond Split Flex Top King, the CinchFit design is available in standard sizes and in V-shaped sheets for boat mattresses.
Not sure which depth you need? Measure your mattress at its thickest point, including any pillow top or mattress pad you sleep on, then pick the tier above that number and cinch the rest.
Caring for cotton flannel so it stays soft
Good flannel gets softer for years. Bad flannel care is what makes it pill. A few habits that make the difference:
- Wash in warm or cool water on a gentle cycle, not hot.
- Skip the fabric softener. It coats the brushed fibers and flattens the nap that makes flannel warm.
- Tumble dry on low and pull the sheets out slightly damp.
- Wash flannel with other soft items. Zippers and denim are what abrade the surface and cause pilling.
- Expect some lint in the first few washes. That is loose fiber from the brushing process, and it settles down.
What customers say
"Great product. Loved the flannel sheets. They are soft without being slippery soft. I bought the split flex top king sheets. They fit perfectly. Love the cinch sack adjustable fit. I have already put an order in for another set."
"Soft and excellent quality flannel sheets. Best purchase for your split top sleep number bed."
"They are wonderful. The cord is strong and easy to use. Easy to make the bed. The sheets are dreamy. This is my second pair and I love them."
"Wonderfully warm. The sheets are better than expected and the flannel appears to be of good quality. Well worth the money."
"Great quality. Comfy, well-made sheets, and I love the CinchFit!"
Split Flex Top King flannel sheet features at a glance
- 100% cotton flannel, soft and warm, softens further over time
- Jersey knit flex center that fits every split length
- Reinforcement patch so the flex center won't tear
- Two types of elastic, fully elasticized 360 degrees
- Adjustable cord elastic you can re-tighten as fabric relaxes
- Cord lock and storage pocket, laundry safe
- 15 inch deep pockets, plus a 9 inch shallow pocket option
- Fits split top, flex top and FlexTop King mattresses, including adjustable and Sleep Number beds
- Hand sewn in the USA by skilled seamstresses
Ready for flannel that stays put?
Shop CinchFit American made adjustable bed sheets and get your bed ready before the cold sets in. Made to order, so allow 8-14 business days before shipping.
Still deciding on fabric, color or print? Read our full guide to choosing the perfect flannel sheet set.
