Inspired from the famous Bolle CHRONOSHIELD model, the SHIFTER is packed with simple yet innovative features to enjoy the ride. Curved temples, vented lens & Phantom lenses, have made SHIFTER the natural choice of pro racing cyclists.What Is Phantom? Phantom is Bolle's first photochromic lens with phenomenal optical clarity. It adapts to any light condition, ensuring precise visual acuity whatever the weather. The lens tint changes with the light from cat.1 to cat.3. Enhanced vision whatever the conditions. Phantom+ combines all of Bolle's 3 technologies adding a 4th additional element: polarization. Polarized lenses are largely recognized today for their benefits in terms of blocking parasitic light reflections. So it felt right to add them to Bolle's already unbeatable lens technology to improve its level by yet another step. Equipped with Phantom+ lenses, you will be ready to take on any adventure.Thermogrip TechnologyThermogrip thermoplastic rubber is specificaly engineered to get gripier when in contact with water and sweat. Inserted at strategic touch points of frames such as the temples or the nosepiece, it ensures a perfect fit no matter the intensity of your activity.