The AllerZip Smooth pillow protector is waterproof and breathable. It is easy to fit thanks to the zip and is sold in packs of 2. Keeps human body fluids outPrevents growth of bacteria in the mattressKeeps dead skin cells outNo stains on any surface100% Bed Bug entry, escape and bite proofEarly detection, reduces bed bug inspection timeAAFA certifiedNo human smells in mattress fibresExtends the life of the mattress by an average of 3 yearsDurable - the product will last 5 years (with good care) Easy care and install/wash hot/tumble dryTotal peace of mind