Heavy gauge steel coils for firm support; Firm non-allergenic layer is resilient and maintains a long-lasting sleep surface; Durable Perma-Dri® cover wipes clean; No cotton binding! Laminated and lock-stitched binding prevents allergens and bacteria from seeping into the mattress. Entire cover wipes clean!; Fits standard cribs and toddler beds; Passes all flammability, lead & phthalate testing and does not contain toxic fire retardants; GREENGUARD® Children & Schools Certified: This entire mattress is GREENGUARD® Children & Schools Certified for indoor air quality and low chemical emissions to help create a healthier sleeping environment for your baby