SwaddleDesigns Fitted Crib Sheets are made from soft and cozy 100% premium cotton flannel. Baby will love the comfortable texture and softness of pure 100% cotton flannel next to their delicate skin. Whether baby is awake or asleep, when you place baby into his or her crib a soft and breathable SwaddleDesigns cotton flannel fitted crib sheet will feel cozy and warm. When preparing baby for sleep, remember the SwaddleDesigns Goldilocks Guide. Baby should not be too cold or too hot, but just right comfortably warm. Sized for standard crib and toddler mattresses at 28" by 52" and proudly made in the USA.