Protect-A-Bed BugLock Plus Bed Bug Mattress Encasement, California King BugLock Protect-a-Bed's patented and certified 3-sided zipper system is bed bug entry and escape proof. The Secure Seal zipper closure ensures encasement is not tampered with and that bugs can not escape at the end of the zipper. Bite-Proof Sleep Surface The sleep surface is lined with the Miracle Membrane which makes it so bed bugs can not bite through from the inside. It's also waterproof and provides a dust mite barrier for healthier sleeping! Breathable Barrier Fabric Guaranteed NOT hot to sleep on. Allows body vapor to breathe through protector. Easy to Apply: Combination of jersey-knit and polypropylene non-woven cloth-like fabric is lightweight and easy to take on/off. 1 Year Guarantee Limited warranty for fabric and manufacturing defect only.