Perlux Hypoallergenic Tencel 100% Waterproof Crib Mattress Protector - Vinyl, PVC, Phthalate and Pesticide Free 100% Natural Eucalyptus Tencel Fiber Provides A Smooth Surface That Wicks Away Moisture Keeping The Body Cool Membrane Back Coating Protects Against Dust Mites, Fluids, Urine, Perspiration, Allergens And Bacteria (2-Year Warranty) Helps Keep The Sleep Environment For Your Newborn Cleaner and More Allergen Free Will Not Change The Feel of the Crib Mattress (Registered With The FDA As A Class 1 Medical Device) Fitted Sheet Style Design (52" x 28" x 6")