The Sealy Soybean Serenity 2-Stage Foam Crib Mattress & Toddler Mattress features a firmer infant side foam and a cozier toddler side soy foam topper. The square corner design provides a snug fit inside cribs and toddler beds. There is tear-resistant waterproof binding all around. An airflow pocket helps keep the mattress fresh without small metal vents. GREEN GUARD is gold-certified for air quality and a healthier indoor environment.