Playing sport is one thing, but doing it with style is another and the Keelback model has everything going for it - unparalleled comfort, high-quality lenses and a keen look, thanks to its translucent frames. Details: Outdoor family, medium fit, PC TNS Gun, 8 base, 63/39/17/128, B-20.3 polycarbonate lenses. The best choice: Mountain, marine. Polycarbonate Lenses - made from premium grade resin, resulting in a lens that is 20 times more impact resistant than glass and three times lighter, with unrivaled precision and clarity. Polarized Lenses - have a built-on filter that allows only vertically oriented light to pass through the lens, blocking horizontal oriented light, glare is all but eliminated. Oleo/Hydrophobic Treatment - forget about dirt, grease and water drops, outer coating makes it nearly impossible for foreign bodies to latch on to your lenses. Anti-Reflective Treatment - scientifically engineered anti-reflective coating is applied to the inside polarized Bolle lenses. Anti-Fog Treatment - AF coating permanently resists logging and also scratching and chemical attack - applied to the lens for retained properties even after repeated washing and years of use. Thermogrip - temple tips, nose pads and adjustable nosepiece are all made from proprietary Thermogrip. This hydrophilic material has moisture absorbing properties that keep the frames comfortably in place, even during extreme exertion. B-88 Nylon Frame: Only the finest grade nylon, resulting in frames that are exceedingly strong, yet lightweight and flexible. Material: Polycarbonate, Thermogrip, B-88 Nylon. Bolle delivers the highest quality sunglasses and goggles for performance and protection, constantly refining trademark combination of fit, fashion, and comfort, resulting in some of the freshest and most technologically advanced eyewear in the industry.