Detoxifying Charcoal: helps to reduce odors and wick moisture, keeping it 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 Enjoy a fresher, cleaner night's sleep with the Sealy Flex Charcoal-infused Fitted Mattress Protector. This mattress protector features a luxurious flex knit fabric infused with activated charcoal which aids in neutralizing odors and moisture-wicking benefits to keep you cool and dry. Our SilentGard Waterproof protection stays soft and quiet while protecting your mattress from spills and stains. PerfectGrip Sidewalls ensure a no-slip hold on mattresses up to 18 inches tall. Machine washable for easy care and backed by the Sealy Certified Lifetime Warranty.