Butterfly Kisses Organic Percale Sheet Set Twin Set Extra Long CONSTRUCTION Made from 100% organic cotton percale. Fitted sheet fits mattresses up to 16 deep. Twin XL sheeting has a longer fitted sheet to accommodate both standard Twin and Twin XL dorm mattresses. Certified to the Global Organic Textile Standard (GOTS) by CU 847084. GOTS is the international gold standard for organic textiles, ensuring high social and environmental standards from fiber to finished product. Set includes flat sheet, fitted sheet and 1 pillowcases.