sunglasses for mountaineering

The key thing to search for in a high-altitude snow lens is that it has a classification 4 ranking– which implies it will block around 90% of visible light, Yardley states. Lens categories determine the level of darkness: no is absolutely clear and 4 is the darkest you can purchase. Many everyday-use sunglasses are category 3, which block approximately 81-87% of noticeable light. This is fantastic for driving and walking on an intense day, but you need classification four lenses when you are handling the brightness of snow and ice throughout the day at altitude.


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