Safety 1st is not only the name of our brand, but it is also our mission statement. Knowing that every parent wants the best for their infants, we understand how safe and restful sleep plays a vital role in healthy early childhood development, which is why we designed the Serene Snuggles Premium 4.5" Foam Baby & Toddler Mattress in a Box. This lightweight nursery essential delivers expert-recommended ultra-firm support and pressure relief for babies and toddlers by way of a CertiPUR-US Certified 4.5" high-density foam core, ensuring a toxin-free zone. The OEKO-TEX Certified 100% polyester knit cover offers a breathable and hypoallergenic surface for boys and girls to sleep on while being durable and easy to clean. Providing edge-to-edge comfort, the baby mattress snugly fits on any standard-size baby crib or toddler bed (sold separately). Proudly assembled in the USA using globally sourced and domestic materials, our quality crib mattress includes a trustworthy 10-year limited warranty.