The Innerspring Crib mattress employs traditional Bonnell style coils surrounded with quilted layers of organic cotton and wool that with extra tufting achieve a truly firm mattress to provide that perfect feel for a newborn baby. The coils have not been treated with ay oils or chemicals. Innerspring Crib Mattress size is 28" x 52" The carded organic cotton adds comfort. While the multilayered pad construction prevents padding migration and maximizes longevity. Specifications: 100% Organic Cotton fabric cover & contains14 gauge Bonnell style coils.