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Do you sweat a lot when you sleep? Down's alright if you can dry it out - possibly ok in the US in summer...
Personally I've stuck with Primaloft for insulated clothing, it stays warm when it's wet and dries quickly - if you're on a budget/not sponsored, buying for long-term use and in UK conditions I really struggle to justify buying down stuff.
Rab vest weighs ~190g, Patagonia jacket ~270g with a hood. Both wash easily if needed. The pack size is larger than down for both, but the Primaloft Gold stuff in the vest especially is really warm. I've slept in both without a sleeping bag and used as an extra layer with a 2 season bag and been fine, I think I'm a pretty warm sleeper.
atk-
I was thinking more along the lines of, get off bike, go to sleep covered in sweat, muck, rain, etc.
How does Primaloft compare with the Polartec stuff? Too many feckin' materials!
This is what Jesse used: http://www.bergfreunde.co.uk/hagloefs-lim-barrier-pro-hood-synthetic-jacket/
hippy
How does a down jacket cope with sweat (also, rain) though? I figured that's why Jesse went synthetic because down doesn't cope when it's wet?