The Simmons BeautySleep Naturally Sunny Day Crib & Toddler Mattress has a renewable soy enhanced core that is firm and soothing so baby sleeps better. Greenguard & Certipur-us certified. Breathtakingly soft water resistant natural cotton fabric cover offers soothing comfort. Chemical free cotton wrap. Mattress meets or exceeds all federal flammability standards without the use of harmful chemicals. Limited lifetime warranty against defects in materials and workmanship.