Breathable and washable from cover to core, Newton's waterproof twin mattress is a nighttime game-changer. The removable quilted cover is made from a double layer of soft, airy fabric, while the innovative Wovenaire® core is firm to encourage healthy development and ultra breathable for a sound night's sleep. The clincher? The entire mattress is washable, so you can keep it fresh for years.GREENGUARD Gold Certified, contributing to cleaner air in your home. Cover: viscose and polyester. Wovenaire® core: food-grade polymer. Fully breathable for cool comfort. Comfortable yet firm enough for child's musculoskeletal development for a sound night's sleep. Mattress core is shipped in 3 pieces. Cover: Machine wash cold, delicate cycle (zipped close); tumble dry low; do not bleach. Core: Hand wash in shower or with hose; air dry standing upright (avoid direct sunlight or heating elements). Imported.