Lock-Up Total Encasement mattress, box spring and pillow covers are guaranteed to trap bed bugs in and keep new bed bugs from entering. Waterproof, durable, soft terry cloth fabric cover with double knit body and waterproof inner membrane.  Breathable, to reduce heat build up and sweating. Zipper lock prevents bed bugs and dust mites from getting to mattress, springs or pillow. Impermeable to mold and bacteria. Silent for a safe and sound sleep. 5 year limited warranty.