Enjoy lasting comfort and support with the Simmons Beautyrest Platinum Sleep System Mattress. Designed with a highly breathable, durable fiber construction, water-repellent cover, bamboo-infused washable cover, and an airflow-promoting Olefin grid. Its dual-firmness design provides a supportive sleep surface for infants and a more comfortable medium-firm side after 12 months, backed by a lifetime warranty.