As Newton's top-of-the-line mattress, the Waterproof brings together the best of both worlds: unmatched breathability on the infant side plus built-in waterproof protection on the toddler side. Every parent knows that spills, leaks and accidents are part of the journey — and the Newton Waterproof Crib Mattress is built to handle all of it without skipping a beat. At the heart of this mattress is Newton's patented Wovenaire® core that allows air to flow freely in every direction, reducing the risk of suffocation according to independent lab test results and overheating while keeping sleep temperatures cool and comfortable. One side of the cover has a dedicated waterproof layer that stands guard against moisture, leaks and messes, protecting the core and keeping your little one's sleep environment clean, dry and healthy. And when it's time to freshen things up, the entire mattress — cover and core — is fully washable. GREENGUARD Gold Certified for low chemical emissions and measuring 52" x 28" x 5.5", this is the mattress that works as hard as you do, from the newborn stage all the way through the toddler years.