Features Precision-Fit corners and a 1″ elastic cuff on the fitted sheet for a clean, crisp fit that won't slip off your mattress, enveloping pillowcases to keep your pillow secure, and an additional 4″ width to the flat sheet for complete coverage. Ideal for adjustable base or standard mattresses up to 18″ deep. Twice as soft as cotton, TENCEL Modal fibers are ecologically blended from the pulp of European beechwood trees, utilizing natural elements to provide a light, silky feel. PureCare's Modal sheets and pillowcases feature a sateen woven blend of long-staple cotton and TENCEL Modal fibers, providing a smooth, supple touch and long-lasting comfort. PureCare's entire collection of sheets bear the Women's Choice Award seal.