Fabric WATERPROOF PROTECTION: 100% waterproof layer protects baby's mattress from leaky accidents, moisture and spills for a fresher, cleaner sleeping surface QUILTED COMFORT: Cozy, soft knit top is comfortable for baby; quilted filling keeps infants and toddlers comfy throughout the night SECURE FITTED DESIGN: Fitted skirt stretches to wrap underneath crib &toddler bed mattresses for a secure fit; elastic edge helps hold the cover in place EASY-TO-CLEAN: Machine washable and dryer friendly for easy cleaning. Extensively wash and dry tested for quality and resiliency SAFETY & QUALITY TESTED: Safety and quality tested for long-lasting use and durability. Meets the Childrens Safe Products Act and Chemicals of High Concern to Children (CHCC) regulations as introduced by states like Washington and Vermont, among others