The Fox Flux is the lowest scoring half-shell mountain bike helmet in our test. It is the second heaviest helmet and has a one of the least user-friendly retention bands. Though, the Flux holds up to every day wear and tear better than some helmets because the polycarbonate shell wraps completely around the lower edge of the polystyrene foam, protecting it from dents and dings.
Fox is better known for its full-face offerings, apparel, and protective gear. The Flux is one of the two half-shell mountain bike helmets they currently produce. The other is the Striker, which we have not yet tested. Unfortunately, we think there are much better options in the extended coverage half-shell mountain bike helmet market.
Our absolute favorite helmet is the Troy Lee A1 which earned a high score in all of our tests and took top scores in comfort and durability. If you wear goggles while you ride, we highly recommend the Bell Super which has an awesome visor that can accommodate goggles being worn on the front of the helmet while you climb. If you are a more cross-country oriented rider we recommend the uber light Giro Xar.