We make our Willow mattress from a natural coconut palm fiber and latex-free foam to create a completely organic inner foundation that supports your baby's sleep. Nothing but 100% soft cotton fabric for your baby. We pride ourselves in our craftsmanship, which is why the Willow mattress is carefully engineered and balanced so it can be used on BOTH sides. It's like getting two mattresses in one! Easily fits into your MDB crib. Ten Year Limited Warranty.