I've been using it for about 6 months and as long as the temperature does not exceed 70 degrees it stays on the helmet. It's not as aerodynamic as it could be, but definitely better than a regular helmet. In winter it's great, in 28 degree weather all I needed was a medium weight skull bag. The lid snaps in and out easily, but is completely secure. I recommend some kind of hard shell to hold it in, it seems to crumple really well.
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