Photochromic sunglasses have lenses that change tint depending on the weather or surroundings. The benefit of photochromic lenses is that in dull, overcast weather or darker surroundings (like running or cycling through woods or early / late in the day) they will lighten, usually to a category 1 or 2. But in bright, sunny conditions they will go dark to a category 3 (and sometimes category 4). It’s also now possible to have photochromic polarised lenses. Photochromic lenses are popular with cyclists, runners, skiers, tennis and fishing enthusiasts. It’s worth noting that all Serengeti models come with photochromic lenses.
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