Naturepedic Organic Breathable 2-Stage Crib MattressOrganic Breathable 2 Stage Baby Crib Mattress combines breathability and waterproofing for a safer, healthier and more hygienic crib mattress design. The mattress starts with a firm, flat waterproof surface made from non GMO sugarcane that is so pure, it actually meets food contact standards and easily wipes clean. This approach protects the inside of the mattress from urine, spit up, and other messes. We then add a 3 dimensional cover with a soft