Featuring balanced support throughout, Serta’s Tranquility Super Firm Crib & Toddler Mattress is outfitted with heavy-duty coils, corner supports and full perimeter border wire. Plus, its easy to clean stain resistant and waterproof vinyl cover makes unexpected accidents less of a mess. It’s also designed to stay with your child from birth through their toddler years, just flip it as your child grows; the labeled infant and toddler sides provide the ideal support and comfort for each age range. All Serta crib mattresses are GREENGUARD Gold Certified and meet the strictest standards offered by the GREENGUARD Environmental Institute, which recognizes products with low chemical emissions, contributing to improved indoor air quality.