These fitted sheets are made from super-soft cotton jersey. They have an elasticated edge so you can easily stretch and fit over any of our pram/crib mattresses. The fabric is OEKO-TEX 100 certified, which means the sheets are free from any harmful substances, and kind next to your baby's delicate skin (as well as the environment!). Features: Fabric: 100% Cotton Jersey Machine washable at 40 degrees. Dimensions: Dimensions to fit pram or crib: 90 x 40 cm.