SlumberShield also features SecureZZZip with a propietary BedBugBanisher Zipper Lock. Our independently tested and certified mattress encasements provide complete impermeability from bed bugs thanks to our BedBugBanisher Zipper Lock and may be purchased in custom sizes. This gives our customers a peace of mind that their mattresses and box springs are protected even if bed bugs are present in the home because SlumberShield encasements ensure that bed bugs will be properly contained within so that their human posts are protected.