This mini crib mattress combines breathability with waterproofing for a safe, healthy and hygienic sleeping environment. It starts with a firm, flat surface that's easy to wipe clean to protect the inside from any liquids or other messes. The soft cover increases airflow that improves temperature regulation and allows baby to breathe directly through the cover if necessary. It also features a waterproof backing, which eliminates the need for an additional waterproof pad. The mattress also features seamless edges and edge support. Fits standard size mini cribs (approximately 3" x 37" x 23.9") Fabric and filling throughout passes all federal and state flammability standards without any fire retardant chemicals or flame barriers Food-grade waterproofing and recycled polyester fiber fill Removable, machine-washable cover; spot clean mattress Toxic chemical-free; vinyl-free; phthalate-free; polyurethane foam-free; formaldehyde-free; pesticide-free GMO-free; glue/adhesive-free Polyester/polyetheylene with polyester cover Made in the USA Kids' Wear MADE SAFE® Certified with nontoxic ingredients not known or suspected to harm human health or environmental ecosystems GREENGUARD Gold Certified UL Formaldehyde Free Verified