CottonMATERIAL: 100% Long-Staple Combed pure COTTONPRODUCT: Pillow Case Set includes 2 Pieces: 21 X 31. Easy to care: machine wash, no bleach, tumble dry low.QUALITY: Because we manufacture in-house we have complete control of every single manufacturing process of our products. Each product goes through 5 quality checks. We procure the highest quality extra-long staple combed 100% Cotton, weave it on the latest airjet looms, and finish it on the most sophisticated European machinery. It is stitched, packed, and shipped by hand.OEKO-TEX MANUFACTURING: Woven, Processed, and Stitched in-house at our own dedicated vertically integrated manufacturing facility. This facility is CERTIFIED STANDARD 100 by OEKO-TEX: an independent certification system for textiles that tests products for harmful substances.100% SATISFACTION GUARANTEED: Customer satisfaction our top priority and we mean it. We stand by every single one of our products. We thus provide you with 30 DAY Warranty on all our products. Purchase with confidence and feel free to reach out to us anytime.