Front: 52% cotton, 48% TENCEL Lyocell.Back: 100% cotton.By choosing our cotton products, youre supporting our investment in Better Cottons mission. This product is sourced via mass balance and therefore may not contain Better Cotton. Learn more.STANDARD 100 by OEKO-TEX Certified: tested for 400+ harmful substances. 21.HUS.86232 HOHENSTEIN HTTI