DISCLAIMER: I have not yet cycled with this! I use this for snow sports and it's fantastic. I have not cycled with it--yet--but I can see how it may be problematic breathing if exertion intensity increases. As far as breathing on the slopes, there's no problem. I'm the only person in my group of 5 in Austria that didn't get a little chill blane or even frost bite on a -15 F degree day in the Alps. It's effective for warmth and wind protection.