HM6 ventilated high-impact Acrylonitrile Butadiene Styrene (ABS) safety helmet offers superior all day protection in various industries environment, HM6 is one of the best quality helmets that meets performance tests of MS183 with excellent rating. the latest innovative ventilation shell convects hot air out & draws in cool air, reducing helmet temperatures.  The HM6 is equipped with optional pinlock molded harness or ratchet webbing harness with 3 points harness depth setting.