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If you like being cold going downhill then no, i guess you don't?
it is essentially a gilet with arms - designed for a boost to your overall warmth when conditions change quickly (whether that is when you're stopped for a mechanical, before sunrise/after sunset, you're at a cafe stop or you're going down a hill for a long time and the wind is chilly)
its a pretty versatile garment actually.
I had the proteam flyweight jacket and rated it. Did you try it on a windy day or on a long descent - ie, the situations it was designed for?