The Assos Donzi Fotodynamic cycling glasses feature photochromic lenses that adapt to ambient light conditions for optimal visual comfort. Light transmission fluctuates between 15% and 74%, depending on whether it is dark or bright. The lens improves contrast to highlight changes in texture, road defects and obstacles on the trail. Finally, these sturdy glasses will not break if impacted or dropped, making them suitable for road cycling, gravel biking and mountain biking. Technical specifications: Conditions: changing light conditions Light transmission: 15% to 74%- Changing light, cloudy weather, riding in the woods, etc. - Enhances colours and reduces glare - 100% UV protection- Interchangeable lenses with other models - Oleophobic and hydrophobic: reduces problems associated with fingerprints, sweat and water splashes - KraterCooler technology: air vents, optimised cooling and anti-fog ventilation- Compatible with Assos Optical Clip for prescription lenses - Adjustable nose pads and temples - Frame and lenses bounce back instead of breaking on impact - Brand: Assos