This crib and toddler mattress helps you create a safe and supportive sleep environment for your little one. It is designed with 150 heat-tempered innerspring coils and reinforced steel edges to provide consistent, firm support across the entire surface. The 100% waterproof and stain-resistant cover features a lock-stitched binding that resists moisture and mildew, making it easy to wipe clean with a damp cloth. Because it is GREENGUARD Gold certified and tested for air quality, it ensures a healthier indoor environment by being free from harmful chemicals and toxic fire retardants. Plus, the lightweight design makes it easy to lift when changing bedding for either a standard full-size crib or a toddler bed