This dual-firmness, infant-to-toddler mattress is constructed with a base of soft-yet-sturdy eco foam, and a soft-knit, organic cotton cover. The cover also features waterproof backing, and a flammability barrier. The real draw here, though, is the presence of two specific mattress sides: one for infants, and one for toddlers. The infant side is coated with KulKote Gel for optimal temperature regulation, while the toddler side features durable and supportive microcoils, which help relieve pressure and improve posture.