The Trek"s mission is simple: to achieve optimum performance while moving fast in extreme environments by providing highly technical, yet lightweight eyewear. For those committed to the outdoors via mountaineering, climbing and trail running, the Trek is the perfect combination of technical mountaineering principles and lightweight performance ergonomics. Detachable shields black lateral rays from intense glare as well as offer superior ventilation when necessary. Julbo"s Flex Nose design and 360° adjustable temples provide optimum hold.