PETZL - Vizir Shadow, Tinted Eye Shield for Helmets LIGHTWEIGHT: Only weighs 65 grams, the VIZIR SHADOW rests on top of your helmet when finished using. PERFECT ADDITION: Mounting inserts for easy installation on VERTEX (2011 version and later) and ALVEO helmets. EASY TO ADJUST: Pivots quickly from work position to storage position on top of the helmet. KEEPS THE SUN OUT: Features level 2.5 solar protection filter that protects the eyes from sun. WEATHERS ALL CONDITIONS: Treated to resist scratches and fogging.