Matress protector Attention should be paid to the absence of permeability of the liquid. It should be noted that the plastering of the bottom should be plastered with PU or PVC. PU polyurethane is a softer product. It can be a more effective product to prevent the liquid-proof part from breaking after washing. upper fabric is made of 100% cotton fabric or knitted terry fabric with 20% polyester and 80% cotton fabric is also produced.