Our aden by aden anais fitted crib sheet is made from 100% cotton muslin for the softest feel possible against baby's delicate skin. Rest assured your little one will be kept warm in the cooler months and cool in the warmer months; thanks to the breathable open weave material. We've designed our fabric to withstand years of use and washes while remaining super soft for baby's peaceful night's sleep in their crib. This lightweight sheet fits most standard crib mattresses up to 52 inches long by 28 inches wide while the fitted elastic keeps everything in place for a full night's sleep. With a wide range of playful prints to choose from; you're sure to find a style that suits your nursery decor for little girls or boys. We recommend machine washing before first use and enjoying touchable softness wash after wash.