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Interesting. I had only used mine for chain gang training in slightly warmer weather before, and found it good. Yesterday was my first go with a base layer and I found it great at 'club pace' and on a (Strava) Cat 3, 15 min climb. I agree that it'd benefit from some vents, but apart from getting a bit cold when we were going at walking pace yesterday, it was ideal. Also find it a lot more breathable than my gabba, and not quite as 'cycling sex gimp', which makes me feel like a bit of a pratt on our very 'social' Sunday club runs.
In the wet I'll reach for the gabba, but for frosty mornings I reckon the PT Jacket is exactly what I'm looking for.
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I probably sweat more than the average cyclist, which is why I get on with the wetsuit 'warm and wet' Gabba, instead of the PTJ. It just irritates me that it's billed as a 'jacket for fast winter training' when it's actually pretty rubbish for anything tempo or above (it's probably fine for chugging along in z1/z2). The espresso jacket really is excellent though - warmer than the ptj and yet also cooler because of the vents.
As Dov says - horses for courses.
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: