The Bundle of Dreams full mattress bundles the best features available for your child’s comfort and safety. As most cribs now convert to a full-size bed, we knew we needed to design a mattress to meet the same quality standards as our crib and twin sizes. This mattress is designed to last years, possibly even after your child heads to college. Unlike a traditional mattress, having a zippered water repellent cover allows you to just replace the cover if needed rather than having to replace a whole mattress. This means you only need one mattress after your little bundle leaves the crib.