Today was an experiment...
Pittsburgh both at 11am & at 8pm: 25 F. This is my 2nd winter 100% carfree commuting. I am trying to be a little smarter this year, we'll see.
head: a light Sugoi synthetic polysomething headcover, helmet, sunglasses
torso: 1. coolmax wicking shirt, 2. wicking longsleeve shirt, 3. light merino wool sweater, and 4. a heavier "fisherman's" wool sweater;
legs: knee warmers (P.Izumi) under REI rain pants;
hands: ragwool mittens over Fox Incline (ultralight) gloves
feet: wool socks, newish Lake mtb boots
NOTES: Ok, the experiment: Today was the first sub-30 F (sub 0 C) day here I think. I have this brand new winter (it blocks wind like a mother) riding jacket that I grabbed on sale (super-$$$, I got it for 65% off) but so far it makes me sweat way too much.
Okay, I thought, its not time to use this jacket yet.
I pulled on the two sweaters over the wicking stuff and I felt...fine. I know you know what I mean. Wool allows this cold air to penetrate to the point that I can feel it but, yet, I'm not uncomfortable.
Conclusion: I will keep the sweater combo going for now. I just recalled that this is how I did it last winter for the most part.
But on rides longer than a 10 mile commute? Also I expect this jacket will be more important for sub 10 degree w/ windchill days.