Vallon - Heron Mountain - BLACKStel: BLACK leather Glas: GREEN ABOUT THE DESIGN: A classic alpine design fitted with Cat. 3 lenses. The lighter lenses offer greater visibility than glacier glasses and are often better suited for outdoor activities such as hiking and skiing, as the leather side shields and high tech lens technology still provide exceptional protection in strong sunlight. OPTICS Cat. 3 lenses The Cat. 3 lenses have a 12% VLT that, combined with the leather side