The Ultra Breathable 2-Stage combines an organic waterproof crib mattress with a removable washable breathable cover. This approach provides all of the safety benefits of a breathable crib mattress while maintaining a practical, easy-to-clean hygenic design. Its intelligent use of healthy and natural materials eliminates the need for flame retardant chemicals and barriers. This incredible combination of organic + breathable + practical makes the Ultra Breathable 2-Stage the healthiest and safest crib mattress available.