Protect-A-Bed BugLock Plus Bed Bug Mattress Encasement, Twin jersey-knit and Polypropylene Imported Fits Twin size mattresses 6 to 10 in. high Dimensions: 38x75 in Polyurethane Miracle Membrane lining on top sleep surface is also waterproof BugLock with Secure Seal locks bed bugs in or out protecting your mattress Stretch-knit side panels allow for easy installation Machine washable in warm or hot water. Tumble dry on medium heat. Do not bleach or dry clean