DreamFit Luxury Bed Sheets are designed and constructed with a patented corner strap design and super-strong elastic binding, guaranteeing the fitted sheet will stay on any mattress, thick or thin, even with feather beds, mattress pads, or toppers. The flat sheets are oversized both in width and length, and are large enough to tuck under any size mattress. The flat sheet and pillowcases feature satin piping. Each sheet set includes: 1 fitted sheet, 1 flat sheet, and 2 pillowcases (1 with twin size). Extra pillow case sets available on our web site. Also available in twin extra long, full, queen, king and California king sizes.