Smith rules. The IO is a beautiful and simple goggle, and the first thingto point out how easy it is to change lenses. Simply flip two small levers, andthe lens pops right out. Some of you may not think this is important, but that just means you've never seen properly while youâ€™re skiing. Every day has differentlight, and to enjoy it to the fullest, you need to change out your optics. I hateflat light because I can't see the different subtleties in the snow, but snap in thesensor lens you've got in your pocket and blammo! Itâ€™s like you're in the directsun. Clouds part, sun comes out, 30 seconds on the chairlift and you're back toprotected eyes. Sounds silly, but believe me, swap lenses once in these gogglesand you'll never go back.