•Rayon from Bamboo: helps to wick moisture, keeping your protector fresher and cleaner between washes •PerfectGrip Skirt: Stretches to fit mattresses up to 18 inches deep for a perfectly snug fit.on all mattress types •SilentGard Waterproof protection against spills and stains  •Flex Knit fabric: stretches and recovers •Machine Wash: Conveniently machine washable for easy care and a clean, healthy bedroom •Lifetime