Gently used for a short period of time Keep your baby’s crib clean and fresh without vinyl/PVC, phthalates or other questionable waterproofing materials. Our three-layer system consists of 100% GOTS certified organic cotton on top and bottom with an ultra-thin waterproof layer in the center to block liquids while still allowing water vapor to pass through for a more breathable sleep. Plus, our soft, flexible stretch-knit fabric is so quiet you won’t even know it’s there!