Finding high thread count cotton sheets for a split king bed can be challenging, but not at Bed Linens Etc., We stock a complete line of all cotton split king bedding. Split king beds are also called dual king beds. A split king sheet set is made with one flat sheet, two fitted sheets, and two king pillow cases. The flat sheet is not split. Split king beds are composed of two twin Xxl mattress 39"x84". We offer our 400 thread count split king bed sheets in in deep pocket (6"-16") or extra deep pocket (16"-22"). Our 400 thread count sheets are made from soft 100% cotton. We invite you to browse our selection of premium split king bedding. We also stock cotton mattress pads for split king beds. Contact one of our courteous, knowledgeable customer service specialists with any questions.