100% Cotton, Fully elasticized, 10" Deep Pockets, Fits on standard 28 inch x 52 inch crib mattresses, 100% Cotton Woven Flannel^Fitted Crib Sheet Fits Standard 52 in x 28 in Crib Mattress and features deluxe 10 inch pockets^Fully Elasticized to Ensure Snug Fit^Machine Washable