Ampersand Twin Size Waterproof Mattress Cover - Hypoallergenic Fitted Protector for Potty Training, Bed Wetters, Allergies, Dust Mites, Bed Bugs, and More Protects Against Dust Mites, Fluids, Urine, Perspiration, Allergens And Bacteria (10-Year Warranty) 100% Waterproof Barrier on all 4 sides of mattress; Independently lab-tested to be 100% Bed Bug Proof Great For Those With Kids, Pets, Allergies, Asthma, Eczema Or Incontinence Will Not Change The Feel of Your Mattress (Registered With The FDA As A Class 1 Medical Device) Fitted Sheet Style Design (Twin and Full Size Fit up To 14")