The Oxford Baby Paradise Dual Stage Crib & Toddler Mattress consists of a Tencel core (made from Eucalyptus fibers), a wool plush layer on the toddler side, and an organic cotton cover. It is 100% breathable, durable, tear resistant, VOC and foam free, lightweight, and antibacterial. Additionally, it is hypoallergenic, water resistant, and meets all flammability standards. This product is Greenguard Gold Certified, meaning that it has been tested for over 10,000 chemicals and VOC's, and promotes a healthier sleeping environment for your little one.