I thoroughly tested this last week and am quite pleased. It was raining and the temperature was in the low 40's. After a 20 minute ride ride down the Interstate, I spent the next six hours walking around a parking lot observing a motorcycle safety class. It rained all day and eventually reached the mod 40's. I was wearing the vest over a heavy wool sweater with a merino wool base layer. The vest was on high for at least the hour then lowered down to 3 for about an hour and down to 2 until the battery died. Even without the heating elements, I was still reasonably warm for the ride home. Now I just a spare battery (o:
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