Our 400-thread count cotton sateen sheet set has eveything you need for the perfect night's sleep. This sheet set is wrinkle resistant and low pilling, which means it will stay soft and smooth after each use and wash. It also features Flexi Fit technology on the fitted sheet, ensuring it fits snug and tight around your mattress. It also helps you quickly identify the top and bottom ends of the fitted sheet for easy placement on the mattress. Fitted sheet fits mattresses anywhere from 8 in. to 20 in. Pair with our Home Decorators Collection Down Insert, available in light warmth and medium warmth. You can be confident in your purchase as this sheet set is certified STANDARD 100 by OEKO-TEX®, meaning they have been independently tested for harmful substances according to strict scientific criteria that go beyond global legal regulations.