PureCare Elements Bamboo sheets are a soft, sateen woven blend of premium long staple cotton and lush bamboo rayon fibers. 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 secure 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 for Twin and Twin XL) All PureCare Elements sheets feature antimicrobial silver chloride to inhibit bacteria, mold and mildew that cause deterioration, stains and odors on this product.