For 40 years, DuPont has been committed to helping protect firefighters and other first responders with science-based innovations such as flame-resistant fibers and filaments, non-woven substrates, protective finishes and chem./bio membranes.Seventy percent of your turnouts thermal protection comes from the inner components of DuPont Nomex and Kevlar. DuPont Nomex and Kevlar brand fibers provide superior strength, durability and thermal protection that stands up to the heat.