MSA's Thermalgard Slotted Caps are high-strength yet lightweight helmets intended for environments where workers may need a helmet with elevated temperature capability. A beaded edge enhances rigidity in this injection-molded hard cap with its rivetless shell of glass-reinforced nylon. Thermalgard Type I Hart Hats meet or exceed the requirements for a Type 1 helmet (top impact) as defined in ANSI Z89.1 2003, Class G (electrical-low voltage). Color: White