With the Safety 1st Tranquil Dreams Crib and Toddler Bed Mattress, you get a mattress made with natural cotton, polyester and wool fibers that will send your little bundle of joy straight to a tranquil night of sleep. With its high-density thermo-bonded core, this mattress provides a firm and supportive sleeping surface that will last throughout your child's development. The Tranquil Dreams mattress also comes with a removable outer cover made from polyester and rayon of Bamboo that is both water resistant and washable for easy cleanups. Fits standard cribs and toddler beds. Assembled in Canada.