Your fitted sheet is worn out but the flat and pillowcases still new! It''s very common that fitted sheet wears out much sooner than flat sheet and that is due to that fact that fitted sheet is subjected to body and feet friction much greater than flat sheet. The Luxurious Abripedic Bamboo 600 Thread Fitted Sheet gives you the option to just replace only what you need. Made from 100% Bamboo Viscose and woven at 600 Thread count per square inch puts this in a class about the rest. The bamboo fabric in cool to the touch and has body temperature regulated features. - 100% Bamboo Viscose- 600 Thread Count per square inch- Body Temperature- Regulated- Fits up to 18-Inch mattress- Fitted sheets made with elastic all around for a snug fit- Abripedic™ Collection- Machine-washable Available Sizes Include:- Twin-XL Size: Twin-XL Fitted Sheet 39 inches wide X 80 inches long Fit up to 18 inches"™ mattress deep.- Full Size: Full Fitted Sheet 54 inches wide X 76 inches long Fit up to 18 inches"™ mattress deep.- Queen Size: Queen Fitted Sheet 60 inches wide X 80 inches long Fit up to 18 inches"™ mattress deep.- King Size: King Fitted Sheets 78 inches wide X 80 inches long Fit up to 18 inches"™ mattress deep. - California King Size: California King Fitted Sheet 72 inches wide X 84 inches long Fit up to 18 inches"™ mattress deep.