This waterproof sheet protector ensures that no sheets or mattresses are spoiled from accidents that occur during the night.versatile mattress protection: place underneath the bed sheet for babies when using in a crib. For older children during potty training, place on top of the sheet while tucking the flaps under the mattress on the sides! perfect for protecting mattresses: protects mattress and keeps bed sheets dry throughout toilet training. Waterproof: 100% waterproof with non-slip backing, bleachable, machine washable & dryer-safe. Soft & comfortable: soft quilted poly-cotton surface with tuck-in flaps is absorbent. Use on any size bed!: crib, twin or for those middle of the night visits to mom or dad. Product Features: Versatile mattress protection: place underneath the bed sheet for babies when using in a crib. Perfect for protecting mattresses: protects mattress and keeps bed sheets dry throughout toilet training Waterproof: 100% waterproof with non-slip backing, bleachable, machine washable & dryer-safe Soft & comfortable: soft quilted poly-cotton surface with tuck-in flaps is absorbent Use on any size bed!: crib, twin or for those middle of the night visits to mom or dad