- Adequate eye protection for a variety of activities (flying rocks from mountain biking, falling ice while mountaineering and ice climbing, etc...)
- Adequate Ultra Violet (UV) protection especially for mountaineering and above tree line trail running
- Light weight and comfortable---a must for trail running
- Form fitting to your face and does not slide off your nose even during heavy sweat and while performing all your activities
- Does not fog up in high intensity activity
- Inter-changeable lens for limited visibility (high contrast amber for dusk and dawn) and night movement using clear lens to protect the eye from branches
Bottom Line: I have not found a pair of sunglasses that fulfill all the requirements listed above, but use specific mountaineering classes with higher UV and wrap-around eye protection and a smaller form fitting pair for Nordic and telemark ski training, ice climbing, trail running and mountaineering. The smaller pair covers less of my face and has less of a tendency to fog up and has inter-changeable lens.
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Other gear for adventure racing and backcountry travel: