These 100% organic cotton sheet sets (Sleep & Beyond) are made from long-staple GOTS-certified organic cotton sateen, 300 thread count, single-ply fabric. The sets include a flat sheet, fitted sheet, and pillowcases (one pillowcase with Twin). They are free of pesticides, harmful dyes, resins, finishes and bleaches, machine washable, come in reusable/biodegradable packaging, and have reinforced elastic and deep pockets (fits up to 18" mattresses).