QuickZip Interchangeable Twin Zipper Sheet White - Goes with Zipper Base. BASE NOT INCLUDED 100% Cotton, Preshrunk Imported Includes 1 QuickZip Twin Zip-On Sheet and goes with the QuickZip Twin Fitted Sheet Base (sold separately). Base Not Included. QuickZip is a patented two-piece fitted sheet that easily zips off and on - All QuickZip Twin Zip-On Sheets are fully interchangeable and zip off and on in seconds so there's no more wrestling with mattresses The only fitted sheet for hard to reach mattresses like bunks, trundles, day beds, lofts, drop-in bed frames. Perfect solution for quick sheet changes in cases of incontinence or bedwetting. Twin sheet - includes one zipper sheet; zipper base not included Made of 220-thread count 100-percent cotton; machine wash and dry Includes a vislon zipper that affixes the two pieces together allowing it to stay securely on the mattress and allows for easy changes Fits standard mattresses 38-inch by 75-inch They're effortless, comfortable, sure to fit, durable and convenient