Fits Low-Profile mattresses measuring 4-9 inch thickness * 100% mattress protection with complete mattress enclosure. * Mattress Encasement with BugLock. Allergen & bed bug proof mattress encasement Zippered on 3 sides * Encasement ensures total protection from allergens, dust mites and bed bugs * This is a complete mattress encasement. You will zip the mattress into this all-sided encasement.