4-PIECE BED SHEET SET INCLUDES - one patented fitted sheet, one extra large flat sheet, and two king pillowcases DEEP POCKET / GUARANTEED FIT - Fits mattresses up to 18 inches deep. 360 degree elastic band tailors the fitted sheet to your mattress. NO STRAY CORNERS - Patented DreamFlex corner straps grip the corners of your mattress. Guaranteed to stay in place, even on adjustable beds. SHRINK and WRINKLE RESISTANT - Machine wash cold and tumble dry low.