Dream On Me Asheville firm fiber crib mattress provides added support that babies and toddlers need for Good night. This mattress is built with a firm polyester 4" Fiber core, a hypoallergenic, antibacterial, waterproof cover for a healthy sleep environment. The durable, waterproof vinyl cover helps lock out stains and moisture keeping the mattress in top condition for long-lasting usage. All Dream On Me mattresses is constructed with quality materials and workmanship in the USA and meet the strictest standards offered by the GREENGUARD environmental Institute, which recognizes products with low chemical emissions, contributing to improved indoor air quality.