Benefits and Features: Durable light weight material is corrosion resistant and flame retardant Ultra high performance filters protects against UV and IR Automatically changes from a light to a dark state when arc is struck Returns to normal when welding stops with dark to clear adjustments available Variable shades from DIN 9 to DIN 13 Outside sensitivity adjustments provides clear vision both prior and during welding Special turnover headband mechanism allows for greater comfort and reduces fatigue Utilizes high performance solar cells with 2 built-in 3V lithium batteries as power back-up Complies with DIN ISO EN safety standards and ANSI Z87. 1-2003 standards Replacement Lenses: 4.5x3.5 inch Part #: 41264