The Smith I/O MAG combines the quick and secure Smith MAG interchangeable lens system with ChromaPop (TM) lens technology delivering you complete optical clarity. The MAG system blends the convenience of an interchangeable magnetic lens system with the security of a quick lock detachment. The I/O MAG includes two lenses -a bright light and a low light performance lens -with ChromaPop (TM) clarity and Carbonic-X durability. Additional features include AirEvac ventilation for fog-free integration with Smith helmets, a revolutionary 5X anti-fog inner lens treatment, and a Responsive Fit frame designed for a contoured face fit. The I/O MAG is your best companion for an epic day on the mountain. Smith I/O Mag Goggles + ChromaPop Pro Photochromic Blue Mirror Lens | Black | Medium | Christy Sports