Material JUNESHE Crib Mattress protector is made of 4 Mil extra-thick new, clear polyethylene. It\'s heavy duty enough to keep your expensive crib mattress and topper safe while storage and moving. With zipper on the end, the bassinet mattress protector is very easy and time-saving to seal. Quantity 1 pack, 2 pack and 3 pack crib mattress encaseme..