reto shape with the latest features. the dragon dr d1 otg 2 has a thermo-formed cylindrical lens and vibrant lumalens® lenses. the double-layer foam ensures high comfort, while the silicone strap provides the best hold.lumalens® gold ionthe lumalens® technology offers optimized colours and glare protection through an ionized lens coating. the hard coating is scratch-resistant and repels dirt, dust, oil, and water.light transmission 13 %bonus lens lumalens® light rosethe light rose lens provides perfect protection in poor visibility. reduces glare, enhances contrast, and prevents early eye fatigue in heavily overcast conditions.light transmission 66 %