Crisp, Cool and Old Fashioned Our Crease Resistant Percale Natural Color Z-Hem Sheet Sets are the best in the market that feature an all-around elastic for the perfect fit that you seek and have 17 Inches deep Pockets. The crease resistance is obtained through the use of a formaldehyde-free finishing chemistry, which is both organic and Bluesign® approved. The organic dye free bedding comes in the fabric’s natural color. The sheets are highly durable, and designed to last for a long time. There are 4 pieces in the set, 1 flat sheet, 1 fitted sheet and 2 pillow cases (1 pillow case for twin sets). The flat sheet and pillow cases have a 4-inch z-hem while the fitted sheet has an elastic band all round.