Fabric Made with milky silky polyester material. The baby crib sheets are super soft, breathable and comfortable for any season and provide a soft place for child to sleep and play. Easy On, Easy Off Our baby crib sheets with 9'' deep stretchier pocket, features a 360 elastic band to wrap the mattress nice and snug and protecting your mattress, fitting most standard crib mattresses and toddler bed mattresses. A whole strong elastic band at the bottom help keep the sheet stay flat right in place securely and snugly to create a safe and comfortable sleep environment for babies. Care instructions Wash at max 45C/113℉. Lay flat to dry, do not tumble dry, bleach, iron, or dry clean.