Photochromic motorcycle sunglasses and goggles react automatically to the available sunlight and are therefore superb for all weather bikers. On overcast days the lens tints are medium to light. On sunny days they darken to a comfortable sunglass tint and when you go inside, they lighten up. Since they darken and lighten in response to the amount of sunlight you can wear them from dawn to dusk and never have to take them off. Also known as photochromatic, transitional, day to night or reactolite sunglasses they're available in a variety of lens and frame options.
Please note, photochromic lenses react to UV rays and will not darken when worn behind a helmet visor or motor vehicle windscreen that blocks UV light. They must be exposed to direct sunlight to darken.