PureCare elements rayon from bamboo pillowcases is a soft, sateen woven blend of premium long-staple cotton and lush rayon from bamboo. 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.