PureCare Elements Bamboo pillowcases are a soft, sateen woven blend of premium long staple cotton and lush bamboo rayon fibers. Designed to provide the ideal fit, our pillowcases feature an enveloping pocket that secures your pillow in the case throughout the night. All PureCare Elements pillowcases feature antimicrobial silver chloride to inhibit bacteria, mold and mildew that cause deterioration, stains and odors on this product.