An Organic Cotton Damask outer quilted to Organic Wool surrounds this all natural latex mattress. Our organic and natural crib mattress has 2 levels of comfort to grow with your baby. The extra firm side is recommend for when the baby is an infant until toddler stage, and then when the baby is a toddler the extra soft side is recommended to add comfort to the toddler mattress. We recommend placing an untreated wool moisture pad and organic cotton pad on top to keep urine off the mattress. Can be used in Toddler Bed also. Size can have a variance of 1/2" in length or width. Standard Crib Size. Made in the USA by Purerest.