Julbo Trek Sunglasses synthetic Trek is the perfect combination of technical mountaineering principles and lightweight performance ergonomics. Detachable shields block lateral rays from intense glare as well as offer superior ventilation when necessary. Julbo's Flex Nose design, Grip Tech and 360-Degree adjustable temples provide optimum hold. This Mountian glass also comes with a removable sweat blocker and adjustable cord. This style comes with the Spectron 4 Polycarbonate lens. This lens also has a Flash finish + Anti-reflective coating which reduces eyestrain and eliminates interference glare.