For optimal safety and comfort for your baby, it's important that your bed or crib mattress is high-quality, firm, and breathable. Made from polyurethane foam, known for its resilient qualities, and snap-on elastics, it provides growing children with the support they need to sleep soundly. The foam has a hypoallergenic, breathable structure that wicks away moisture accumulated during the night, providing greater comfort for your child and preventing the growth of fungi. In addition to being quilted on top, the cotton mattress cover has a mesh lining for improved ventilation.