Waterproof Liner for Big Barker Mini 100% Waterproof. No liquid or moisture will penetrate this liner, not even the worst accidents For use with the Big Barker Mini, Medium size. Goes under the bed cover. Each batch is stress tested under extreme conditions. Guaranteed to keep your foam like new Made in USA. Same material found in hospital beds around the country Very quiet fabric. Won't make noise when your dog steps on it or tosses and turns