And funny I just mentioned this in another post:
That's like people who ask "What's the cheapest helmet I can buy for track days?" I always hear "How much is your head worth?"
I don't know how much water the air bag and closed face helmet issue is. At the speeds you are going and on a closed course I wouldn't be that concerned about this issue.
Open faces are supposed to be more comfortable but I never liked them. Plus I wear contacts so I wanted one with a visor.
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