Lens Type: Photochromic, Mirror Base Curve: 6 Polycarbonate: Polycarbonate is lightweight, comfortable, impact resistant, and provides UV protection. Julbo reinvents mountain goggles with ULTIMATE COVER, combining high protection and ultra lightness. This model provides optimum protection for the eyes and face thanks to a nose guard and removable Spandex side shields that comfortably protect against sun, wind and cold. Weight: 32