You can only scope your line if you can see where you're going. Putting on the Smith I/O Mag goggles is like flipping the switch from regular to widescreen. Smiths' ChromaPop lens tech boosts color and contrast, so every wind lip, landing, and tree glade is as sharp as possible. It gets the highest level of anti-fog treatment that keeps them fog-free through all weather conditions. Whether the day dawns clear or stormy, lens swaps are a snap thanks to the quick-swap Mag lens system. Compatible only with lenses from 20/21 production season. Not compatible with lenses 19/20 or earlier. Smith Mag lens change system uses magnets for quick, easy lens changes Spherical Carbonic-x lens for distortion-free optics and impact resistance 5X anti-fog inner lens for advanced fog-free performance QuickFit strap adjustment system lets you find the right fit fast Ultra-wide, silicone-backed strap stays put Three-layer DriWix face foam wicks moisture for a fog-free fit Responsive Fit frame adjusts to y