Built to keep up with the demands of mountaineers venturing into the most extreme environments, the Julbo Explorer 2. 0 REACTIV Polarized Sunglasses are at home far above the treeline. Photochromic lenses adjust automatically in response to changing light conditions, so there's no need to fiddle with spare lenses when we're scaling sheer cliffs. The lenses are also polarized to cut through the glare from the ever-present snow at high altitudes, and they feature anti-fog and oil-repellent coatings to fight off condensation, snowflakes, and smudges. Removable side shields keep light from creeping in from the sides, and they stop icy gusts from drying eyes out. Julbo also equipped the Explorer 2. 0's with grippy nose pads and 360-degree adjustable temples for a comfy and secure fit that won't slip, no matter how tough the going gets.