Power through grueling runs and long trail rides with the help of the Julbo Aerospeed REACTIV Sunglasses. Designed with input from world-class ultrarunners and mountain bikers who know a thing or two about ultralight performance, the Aerospeed sunglasses are a larger version of the proven Aerolites. With their rimless, single-lens design, you'll never miss a step, and the cored-out frame is ultralight for comfort over the long-haul. Photochromic lenses adapt to changing light intensity, so you don't have to waste precious seconds swapping lenses during races. The Air Link temple system offers subtle suspension improve comfort during seemingly never-ending runs and bumpy single-track rides. And with full venting and an anti-fog coating, the lens won;t fog up no matter how hard you're huffing and puffing.