Waterproof Barrier Our mattress protector features impermeable TPU backing that protects the top of the mattress. It makes it ideal for most situations, such as when you want to protect your mattress from perspiration stains or other bodily fluids and incontinence. The TPU backing (polyurethane membrane) is not only waterproof but also breathable. It allows heat and moisture to breathe through while blocking off stains and liquids etc. from the 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. Smooth Grip System Our mattress protector features Smooth Grip Skirt System which ensures to fit mattresses up to 17 inches deep. It has elastic attached to pull in the borders of the deep pockets to make it easy to stretch and fit the base of the mattress. It works like a fitted sheet, wrapping right around your mattress. Once the bed is made with the correct size mattress protector, it rarely slips and stays in place until removed. Also, it enables airflow technology that allows air to circulate through the protector but repels liquids. Due to the firm fit, restless sleepers, and small children, in particular, would sleep comfortably while twisting and turning in their beds as it maintains an almost smooth finish constantly. Care Instructions Hand wash or machine wash separately in cool to warm water, using a mild detergent (free from any bleach). Please do not use any solvents or bleach, bleach alternatives, non-chlorine bleach or any bleach by-products in the detergent, as this will damage the waterproof backing.