The Lock-Up Total Encasement traps bed bugs in its durable encasement and keeps dust mites, bed bugs and other allergens from invading your box mattress with a durable zipper lock feature. It has a smooth double knit body and waterproof top to protect against liquid spills. Machine washable. Material is quiet and breathable to prevent sweating and heat. The double zipper makes it easy to put on or remove the mattress encasement and bed bug certified.