How do I choose SunGod VLT and polarisation for running or cycling?

Choose the frame model and lens configuration, then check visible light transmission (VLT): it measures the share of visible light transmitted, not UV protection. Bright sun, woodland and dawn/dusk require different choices. SunGod’s guide discusses Smoke, clear and Iris photochromic lenses for different light, but available options and exact VLT belong to each model’s Lens Guide. Polarisation is separate: it reduces some glare but can affect cycling-computer displays and wet-road reflections. Do not infer VLT from mirror colour or assume every Sierras, Paces or Renegades configuration is polarised or photochromic.