Why buy a mattress encasement? A mattress encasement takes protection a step further, completely surrounding your mattress and zipping closed to protect all mattress surfaces from liquids and allergens, as well as blocking the passage of bed bugs. Smooth Jersey Fabric Made with Smooth Jersey fabric, our Waterproof Mattress Encasement provides you with the perfect blend of protection with peaceful sleep. The synthetic Jersey material has bite proof and escape proof qualities that you are looking for so that bed bugs cannot bite through the mattress. Waterproof Barrier Our mattress encasement features impermeable TPU backing that provides protection on all 6 sides of the mattress. This makes it ideals for most situations such as when you want to protect your mattress from perspiration stains or from other bodily fluids and incontinence. The TPU backing (polyurethane membrane) is not only waterproof but also breathable. This allows heat and moisture to breathe through while blocking off stains, liquids, and other bacterias from bed mattress. TPU backing ensures that you won't hear a plastic noise when you move during the night, while the soft top provides you with unparalleled comfort. Vinyl Free The cover is also free from Vinyl, PVC, Phthalates, fire retardants and other toxic chemicals. We are proud to offer material free from harmful substances that makes our box spring encasement waterproof is a TPU film.