I use my Bolle Helix for cycling, and I am quite satisfied with their clarity and comfort. The TNS Fire lens not only look cool, but they provide good filtering without overly dimming, which is important when cycling to anticipate road hazards. Bolle also offers the TNS Fire lens in other models, such as the Bolt or Tempest, so you may have to try different ones, as I did, to find one that best fits you.The center nosepiece is made of metal (aluminum perhaps) and coated with thin rubber for comfort. The rubber coating after less then a year, is now almost completely rubbed off with the metal showing through. For a $80 - $100 pair of sunglasses I expect this to not occur.