Serta iComfort Luxury Sheet Set White California King - Tencel Cooling Technology iComfort Luxury Sheet Set compatible with All Mattress Types and Brands Patented Cooling Technology using TENCEL material - designed to help improve heat and moisture flow - Extremely Soft Breathable Material 4 Piece Set includes 1 flat sheet, 1 fitted sheet and 2 pillowcases Made to securely fit all mattresses up to 16 inches Height. Long Life cycle California King Size