Collection: Split King Sheets

Shop Split King sheet sets for adjustable beds, with fitted-sheet sizing for two separate Twin XL mattresses. Find your preferred fabric and feel, and check each listing for available sizes, mattress-depth compatibility, and included pieces before ordering.

What sheets fit a fully split King bed?

A standard fully split King uses two Twin XL mattresses, each typically measuring 38–39 inches wide by 80 inches long. Each side needs its own fitted sheet so the mattresses can raise and lower independently. A standard one-piece King fitted sheet is not a substitute for two Twin XL fitted sheets.

Measure each mattress's width, length, and depth, including any topper you use. Check whether your chosen Split King sheet set includes two fitted sheets, a shared flat sheet, and pillowcases, or whether pieces are sold separately. Included pieces vary by product.

CinchFit: American-made sheets with a stay-on fit

Our own American-made CinchFit sheets feature a patented cinching system for a snug, stay-on fit. For a fully split King adjustable bed, choose the appropriate fitted-sheet sizing for each Twin XL mattress. Match your mattress dimensions and depth to the listing, then choose from the available fabric options for your preferred feel.

Split King and Split Top King are different

A fully split King has two mattresses separated from head to foot. A split-top mattress is divided at the head but remains connected at the lower portion, requiring a different fitted-sheet design. These styles are not interchangeable.

If your mattress is split only at the top, explore our Split Top King Sheets or Split Top Cal King Sheets. CinchFit's universal split-top design fits all head-split lengths; choose the correct mattress size and depth.

Not sure which configuration you have? Read our guide to Split King and Split Top King sheets before choosing your bedding.