Rilsan® Clear G850 Rnew half-frame design made from bio-based polyamide uses less petroleum for a lower carbon footprint. Ventilation slots in the lens prevent fogging. Optional gray photochromic lens with a wider light transmission range is ideal for changing light conditions. Hydrophobic coating enhances water repellency and keeps the lenses clean, with a special anti-scratch treatment. Interchangeable lens, soft glasses case made from rPET for a lower carbon footprint.