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^^ I'll second that, smith helmets are made to fit perfectly with their goggles. I have a large maze and I/OXs, and they're amazing. if you push the helmet down there is literally no gap at all. They're both great products, you won't regret the decision.
Also, I'd assume the I/O works just as well, but the I/OX is bigger, so if you have a bigger face/head get the I/OX.
I have a large Maze and just picked up the i/ox, they fit perfectly! When I tried someone elses i/o with my maze I had a seizable gap because of how high my helmet sits on my head.
Go to a shop and try them on. I was trying to decide iox or io and with my helmet iox was money and the io pinched my nose. Seriously though try it on with your helmet. Most every ski hill should have a shop carrying smith.