Waterproof Zipper Encasement Proctor For Mattress And Box Spring (King) 100% Waterproof Barrier on all mattress: Independently lab-tested to be 100% Bed Bug Proof Zippered mattress cover fit any mattress depth from 10" up to 18" Non Wovern fabric is cool and comfortable: Breathable waterproof membrane won't trap heat while you sleep Help ease Asthma and other Respiratory conditions by blocking allergens as you sleep 5-year Limited Manufacturers Warranty