Photochromic sunglasses are great for activities like running, cycling, and skiing since they eliminate the need to swap lenses or pairs of sunglasses when lighting conditions change. This is a plus when you're on the go or you don't have storage space for extra shades.
Sunglasses with photochromic lenses aren't just for runners and cyclists. The convenience of lenses that respond to changes in light is also great to have when you're cruising around town or hanging out on the beach.
Sunglasses with both photochromic capabilities and polarization offer the ultimate in convenience and protection. Not only do the lenses adjust in tint in response to changes in lighting, but they're also polarized to reduce glare from reflective surfaces, making them ideal for activities such as skiing, paddling and mountaineering.