Protect either mattress or box spring. Bed bug and dust mite infestations are serious problems that can cause a variety of health concerns including asthma, eczema and allergies. Aller-Zip mattress and box spring encasements provide an effective barrier to infestation. Because treatments can't reach the core of an already infected mattress and box spring, they usually need to be disposed of - but no longer. Aller-Zip protects your mattress investment and most importantly, your health. Its cotton, terry-cloth fabric toplayer is soft and comfortable under your sheets. Guaranteed against leaks or tears for 10 years or the factory will replace at no cost. (Full Extra Long Size: 54x80 in., Fits bedding 12 to 18 in. High) Wash before use for best results. Do not bleach or dry clean.