POSTUREPEDIC ADVANCED ZONED SUPPORT: Legendary Posturepedic zoned support grows with your child's needs with targeted areas of support and comfort. PREMIUM AMERICAN-MADE POSTURE COILS: 204 premium steel innerspring engineered in the USA for a lifetime of support plus a steel support frame and 10 Ever edge Guards all around for added safety and lasting durability. COTTON WATERPROOF COVER: Breathable cotton cover is gentle on baby's skin while a waterproof barrier helps protect against leaky messes and odors. The cover is made with natural cotton and may feature natural characteristics (black spots for example). AIRY COMFORT: Cotton and earth-friendly cushioning creates gentle, airy comfort all around. FIRMNESS and SAFETY TESTED 2-STAGE DESIGN: Grow-with-me zoned support is tested for safe use with infants and toddlers, durability and crib fit tested, plus feel-good materials are made without harsh chemicals.