I have a hearing aid (GN Metrix) in the left. The right is beyond repair. Don't use it in the summer due to wind noise, also, moisture, as in sweat, isn't good for them, at least according to my audiologist. When it's cold enough to wear a balacalva while riding, the wind noise isn't there and neither is the sweat.
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Some people are like a Slinky ... not really good for anything, but you still can't help but smile when you shove them down the stairs.