Waterproof 5-Sided Protection; Fits up to an 18" Mattress, Machine Washable. Protects Mattress and Reduces Allergens., Delivered in 3-5 Business Days, 3-Year Limited Warranty, Top: 100% Polyester Circular Knit With HeiQ Cooling Technology. Sides: 92% Polyester, 8% Spandex with 2-Way Stretch