Medical-Grade Waterproof Protection - Waterproof crib mattress cover with EPA-registered, lab-tested medical-grade surface blocks bacteria, stains, odors & moisture. Easy-clean, tear-resistant, ultra-durable & safe for baby’s crib or bed. 2-Stage Infant To Toddler Mattress - Dual-firm crib mattress grows with baby—firm infant side with anti-sag weight support center, plush toddler side with sustainable comfort layers. Flip design for long-lasting use in standard cribs or toddler beds. Made In USA Crib Mattress Quality - Crafted in the USA using trusted, safety-tested materials. Expert-made 52x28 crib mattress fits all standard cribs & toddler beds snugly. Designed for durability, comfort & peace of mind from newborn to toddler. 204 Coil Posture Support System - Premium USA-made 204 steel coil system with reinforced steel edges and corner/side pillars for superior support and stability. Eco-friendly cushioning maintains safe firmness and comfort as baby grows and moves. Greenguard Gold Certified & ASTM Tested - Non-toxic crib mattress certified for low emissions and cleaner indoor air. No added harsh chemicals, tested for long-term firmness and safety. Exceeds ASTM crib mattress standards. A coil mattress for cribs is tested to more standards than foam ones.