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Yeah, my safety glasses steam up a lot but my Tifosi do not. I've put it down to the Tifosi being further from my face, ie. the nose piece pushes the lenses away. So it's letting more air behind them. Probably not as good on the road, at speed, but when you're climbing some steep bastard thing at walking pace they don't fog up anywhere near as much as the Bolle safteys that sit quite close.
I wear clear glasses whilst riding at the moment due to the water/mud- but they steam up a lot. Are there glasses that people use which resist this better?