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miro_o-
Taking it off feels like what it must have been like when Neo got flushed out of the egg sack in the Matrix
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It's acting as a vapour barrier - popular in the world of winter climbing etc but doesn't seem to have caught on in the world of cycling (except on this thread)
https://andrewskurka.com/vapor-barrier-liners-theory-application/
I know the soft-shell base layer supposedly breathes but it is much less breathable than normal jersey material. I tried it out for these purposes but I sweat too much even when I'm not working particularly hard. I won't talk about my experiment with vapour barrier socks which was gross
youramericanlover
Clownshoe
I took a few new to the bike game dads out and had it on underneath a PTJ. It was about ~6 and the pace was v slow. I was toasty the entire time though. Then did some super mucky trackocross in it with a winter jacket on top and was perfect. Strangly I stopped for 3/4 mins to swap to freewheel (because fixed in the muck is hell on the knees) and by the time I got back on I had to stick on another layer. I think trapped moisture underneath made it hard to get warm again. Anyway it's a hell of a thing, either weird or genius, I can't decide