Set Includes: Flat Sheet, Fitted Sheet and 2 Pillowcases (1 with Twin Set) Woven of 100% organic cotton percale; Organic cotton is grown without the use of toxic and persistent pesticides and synthetic fertilizers. 200-thread count. 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. STANDARD 100 by OEKO-TEX® Certified: WSI Certificate #: 14.HUS.42449: tested for 350+ harmful substances to keep you and your family safe from chemicals common to textile manufacturing. 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.