Protect-A-Bed Bed Bug Box Spring Protector BugLock 3-sided zipper: BugLock Zipper system certified by an Entomology Laboratory as bed bug entry & escape proof. Easy to Wash and Use Machine washable in warm or hot water. Tumble dry on medium heat. Do not bleach or dry clean. Fits All Box Springs Select box spring size from list below. Note Order two for each king size bed. 100% Polypropylene Machine washable in warm or hot water. Tumble dry on medium heat. Do not bleach or dry clean. Factory Guarantee: Guaranteed against leaks or tears or the factory will replace the protector at no cost.