Oeuf The Oeuf trundle mattress will give your overnight guests a comfortable night's sleep on the Oeuf trundle bed. Made from lightweight but durable medium-density foam, this mattress is non-allergenic and safe. The mattress is covered in denim-colored cloth fabric with a cloth binding. Made in the USA. Features: -Sparrow collection. -Made from lightweight but durable medium-density foam. -Non-allergenic and safe. -Mattress is covered in denim-colored cloth fabric with a cloth binding.