"PureCare Refreshing TENCEL Lyocell sheets are botanically crafted from raw wood pulp and provide an exceptionally smooth, cool to the touch sleep surface. Our premium TENCEL Lyocell fibers are woven in a sateen weave for long-lasting softness and comfort. Designed to provide the ideal fit for both standard and adjustable base mattresses up to 18"" deep, our premium sheet sets feature: - Precision-Fit corners for a clean, crisp fit on the fitted sheet - A 1"" Precision-Fit elastic cuff, which prevents your fitted sheet from slipping off your mattress - Enveloping pillowcases that secures your pillow in the case throughout the night - An additional 4"" of flat sheet for complete coverage Sheet set includes: fitted sheet / flat sheet / two pillowcases (one pillowcase in Twin XL) All PureCare Refreshing sheets feature antimicrobial silver chloride to inhibit bacteria, mold, and mildew that cause deterioration, stains, and odors on this product."