The Summit sports glasses feature a unique system to quickly change the lenses. this way the Summit is adaptable to all kinds of circumstances with three included lenses. The Quick-Snap system allows the user to slide the nosepiece down and easily take out the lens. Most unique about this system is the fully integrated design. With the slideable nosepiece up, the system can’t be detected in the frame. The polycarbonate lenses feature a hydrophobic coating for a clear view in humid weather conditions. Water just slides of the lens. The Grilamid frame is flexible and strong at the same time. This version of the Summit has a photochromatic lens which changes in 8 seconds between 17% to 85% light transmission. It’s ideal for quickly changing light conditions.