Shop Iron 41290 Solar Powered Auto Darkening Welding Helmet Automatically changes from a light to dark state in 1/30,000th of a second when arc is struck Outside sensitivity adjustments provide clear vision both prior to and during welding Variable shades from DIN 9 to DIN 13 Special turnover headband mechanism allows for greater comfort and reduces fatigue Durable, light weight material is corrosion resistant and flame retardant