Have never 'used' a helmet except as a hat. The first one was a gift from a friend - have 'wasted my money' on about a half dozen helmets since then, over 35+ years.
(Sound of rapping on head.) Have only ridden maybe 5-10 miles unhelmeted since 1976.
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Bacchetta Giro A20, RANS V-Rex, RANS Screamer