K-T Industries Patriotic Auto Darkening HelmetAuto Darkening at it's best! Sturdy construction helmets are made of lightweight, molded nylon with a ratcheting headgear and moistureabsorbing headband lining. User can customized fit with a special up down, forward backward headband mechanism, reducing fatigue of the head and neck. Sensitivity adjustment knob is located outside the helmet making it more convenient to adjust. Upon striking an arc, the filter automatically changes from clear to dark