Aller-Free Tencel Knit Mattress Protector, Twin X-Large, White 52% Polyester, 48% Tencel Imported Combines Silk like softness, breathability and moisture management to help you maintain a comfortable sleeping temperature Tencel is an eco-friendly natural fiber that is not only Luxuriously soft, lightweight and breathable, but also moisture absorbing Whisper quiet Laminate backing that protects against moisture, dust and other allergens The unique perfect fit power skirt keeps your protector in place as the bed adjusts to your sleep position Will fit all mattress types up to 22-inches, including memory foam; 5-year Warranty; machine washable