Replacement Coveralls for Adult Fire & Hazard Training Manikins by Ruth Lee. These protective coveralls are manufactured with a Nomex blend material which offers protection against high temperatures. It is permanently non-flammable and is often used in protective clothing to protect against heat and flames. These protective coveralls are also reinforced with Nomex webbing which improves the abrasion resistance and strength. The coveralls are fitted using 20mm Kevlar ties (the standard hook & loop fastening melt at high temperatures). The ends of the arms, which have been identified as a high-stress area, are reinforced with 5mm leather to provide extra protection.