Sleep soundly knowing your baby is doing the same. This organic crib mattress made to fit the Alma Crib is comfortable and healthy, providing excellent support with all-natural materials. The inner layer is made from certified organic coir, which is made from coconut husks coated in natural latex for breathable support. The coir is surrounded by lambswool, which provides insulation and natural dust-mite protection. And a removable organic cotton mattress cover adds a washable layer of protection