The Simmons 2 pack waterproof mattress protector will help keep your baby’s mattress clean and stain free for longer use. The 100% polyester is ultrasonically quilted for stability and durability even after many washes. Made with a non-toxic waterproof layer that helps reduce dust mites in baby’s sleep environment too. Fits standard size crib mattresses with a deep gusset to make sure protector fits snugly and safely. Machine washable and low tumble dry.