The I/O is one of the best goggles out there it has excellent peripheral vision, fits great and works awesome with helmets. Oh and did I mention it is a piece of cake to change the lenses. Buy em, wear em and be stoked.
Have always loved this series of goggles. The new I/OX have a better lens swap system and less bulky frame but this set is just as good. Can't go wrong with Smith Spherical lenses. Buy these along with a few other replacement lenses for variable weather. Different types of I/O's fit different face types so there's no excuse to go anywhere else
The weather in mountains is highly unpredictable and can often change by the hour from bright and bluebird to overcast and dumping, but which goggles to choose? You've always had the option to purchase a second lens and try to swap it out mid-mountain should the lighting change, but it was a huge pain...until now. These I/O's have made swapping the lens a breeze, and they even come with two lenses! Couple that with sick style and a great fit and you've got yourself a tremendous product.