BugStop Box Spring Covers are certified bed bug proof, with an internal protective flap and self locking zipper. It also has a waterproof top layer to protect the bed from spills and moisture. Why Should You Encase Your Bed? Certified bed bug proof zippered mattress and box-spring encasements are an essential part of any bed bug prevention and protection program. These encasement covers trap and kill bed bugs already inside the bed and prevent new bed bugs from entering. A bed bug cover allows you to keep your bed, saving money on replacements. It also allows early detection of newly introduced bed bugs. Fiber Content: Two layers of non-woven polypropylene bonded to a meltblown polypropylene filtration layer. Care Instructions: Machine wash up to 140°F. Machine dry cool or line dry. Bed bug covers should be left on for at least one year. To determine size of bed, measure: Length x Width x Depth Please note that box spring covers do NOT stretch. Do not purchase a cover that is too small for your bed as this may tear the cover. For hygiene reasons, we are unable to exchange or refund bed bug covers once they have been opened. Looking for a mattress cover too? Save 5% when you buy the mattress and box spring covers together. Click here. If you are planning on purchasing 10+ mattress and/or box spring covers, please call us at 604-524-5511 for pricing.