- Familiarity: I've put it through the wringer
- Fit: True to size
I have used the Jawbreakers for a few years now and love them for mountain biking. I have the mountain bike and road bike lenses and typically use the mountain bike lens because they are so go in low light and still do well with the sun. The glasses have great coverage and keep any dirt, mud, water out of the eyes. Lens are very clear and have great coverage, but they are Oakley lenses, which are some of the best in the market but scratch easily. The glasses cover the full face and have a really good fit with adjustable arms. Lens swap system is easy and holds lens in securely. The frames are light weight and don't have the feel of much dexterity, but I have battle tested these and have had no issues with broken parts. They have great ventilation and don't fog up at all when on the move. I would highly recommend for Mountain Biking as the best on the market.
I have recently started using for splitboarding with mixed results. When climbing, they fog up because you aren't going fast enough for the air to flow and clear the fog. That is true with all sunglasses I have tried though, as when sweat gets on the lens in cold weather, fog in inevitable. I still use these for skinning as the best option if have found. I have tried on the downhill a few times but when it's cold, the airflow freezes the eyes a bit so they are a no-go. These aren't intended for snow sports but just though I would share my experience.