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 All Purecare Refreshing sheets feature antimicrobial silver chloride to inhibit bacteria, mold, and mildew that cause deterioration, stains, and odors on this product.