80% Cotton / 20% Polyester Terry Top. Imported. Twin mattress protector: Fits standard size (39" x 75") mattresses; Mattress cover with knitted skirt fits mattresses up to 16" deep. Hypoallergenic: Protects children from allergies and allergens; great for eczema and allergy sufferers. Toilet Training: Stress-free potty training with 100% waterproof breathable membrane. Worry-Free: 5-Year Warranty; Machine wash cold and machine dry in low heat; Hot water and Hot drier can deteriorate the waterproof barrier.