Waterproof, breathable and washable from cover to core, Newton's crib mattress is a nighttime game-changer. The removable quilted cover includes a plush layer of airy fabric, plus a waterproof barrier on one side to handle leaks and accidents during the potty-training phase. Made from the company's innovative Wovenaire® material, the core is firm to encourage healthy development and ultra breathable for a sound night's sleep. The clincher? Every part of the mattress is washable, so you can keep it fresh for years.