Prevent injury to the patient in the event of accidental roll-off from the bed. Made of high density, high compression polyurethane foam, encapsulated in a durable Masongard™ cover with out zippers. Fire retardant meets with California Technical Bulletin #117.. Folded sections are held together with hook-and-loop fasteners.. . WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov