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Because @dan is a bear
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I find them useless - cold when I'm cold at the start of the ride and the collar doesn't fit well or protect your neck from the wind, arms are too baggy. They aren't very breathable when working hard, no vents etc. I end up soaking wet with sweat and freezing cold every time - which is why I bought the Gabba in the first place.
I know it's warm for December, but I've also been wearing one of these recently (which is actually better insulated and warmer) without having the same problems:
Wore pro team jacket/Jersey thing today, for the first time since buying a gabba last year. Won't be doing that again. Watch this space for a large blue ptj for sale.