This Pyrolon® CRFR Disposable Coverall is made of FR Spunlace, a 2.5 mil proprietary FR barrier film rated up to 200 degrees Fahrenheit. It meets NFPA 2113 requirements for section 5.1.9 and does not melt or drip. This suit is designed to be worn over primary FRAR protective clothing for environments were flash fire is a concern.