The Eclipse Pure Prodigy is truly unique. Made with our proprietary Center Zone coil system, this crib mattress is designed to help keep babies more centered on the crib mattress and away from the edges where most accidents happen. The Center Zone coil is encased in a 2" edge support which is made with Natural New Zealand wool. The infant support has a double firm layer which is made with eucalyptus, while the toddler side is also supported with eucalyptus and has an extra layer of GOTS certified organic wool. The cover is made with organic cotton, it's removable and machine washable, and water repellent. This mattress has the COCSA (Chiropractic association seal of approval) and is 100% breathable.