There are times when layering is not the way to go. One of them is heavy activity in extreme cold. Layers can cause moisture to freeze in bad places. Having lived in a place that often got down to -40, I was always most comfortable with a light synthetic shirt under a single winter coat. No complex layers. And waterproofing isn't needed as there isn't any water around.

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ErroneousBosh an hour ago | parent [-]

I know someone who has three or four different thicknesses of pure lambswool jerseys for wearing while he's cycling, at different air temperatures. It never really gets all that cold down south here at 56°N and frankly I think spending ten minutes dicking about over which jumper you're wearing for optimal performance takes a lot of the fun out of it.

That said, I'm a fat 52-year-old, and I cycle in jeans and a T-shirt, and if I start to feel cold it's a sign I'm not pedalling hard enough and I should get the boot down a bit, burn some calories.

I'm still faster than many-jerseys-guy.

	▲	sumo89 19 minutes ago \| parent \| next [-]
		If you start doing longer rides you learn there are general temperature ranges and kit that's fine to commute in or ride an hour in traffic with a rucksack is very different from the kit you want on a 6 hour ride in the countryside. I generally have kit for 0-10, 10-15, 15-22, 22+°C. My 0-10 jersey will boil me alive after an hour cycling in 13°C but likewise my 10-15°C will risk hypothermia in 8°C. There's only so much layering you can do with cycling kit before it starts becoming restrictive.
	▲	carlob an hour ago \| parent \| prev [-]
		I'm curious: I do cycle in jeans and a t-shirt while in the city. Up to 45 minutes I'm perfectly fine, but if I'm on the saddle for over one hour I really start to miss the chamois. What's your experience with that?