... quality cloth fabric laminated TPU(polyurethane) film, waterproof and breathable, protect the mattress from wet and dirty.Good breathability performance, ... or reduce its function. If the cover with zipper, when washing, pls close the zipper.TPU film introductionHigh permeability: reach 5000 ~ ... hydrolysis resistance, strong antibacterial.Environmental protection and reusable. waterproof mattress cover