If you've had a rough encounter with the yetis, gapers, or sandpaper, and your goggle lenses are looking super rugged, or if you want to fine-tune your optics for your local conditions, the Smith I/O Replacement Lens is the only lens for your I/O goggles. Because if you can't see through your current lenses and there's no such thing as friends on a pow day, how will you shred the pow?