experimented with lots of wools this year, Grey Wolf Woolens, Woolrich, and Columbia. rraming said it best above..... Better make sure it is lined ! If not lined then it better be a premium wool like Grey Wolf, otherwise the wind will get ya. All the wools we tried were warm on calm days, but in as little as 10mph wind the Woolrich was cold. Columbia was next best and the Grey Wolf even without a liner was top notch. My son has a Grey Wolf bomber jacket and riding an ATV at 30mph the wind would not come thru.
If I was spending the $$$ for SI, KOM, or Grey Wolf I would buy it lined. It is a major investment that you buy once and why worry about spending that much and have the wind blow thru.
The other thing we noticed is the thickness versus nap of the wools. Columbia and Woolrich are high nap, looser weave, thicker, verus the Grey Wolf tight weave. Seems the higher nap looser weave might seem warmer, but it isn't !!! Better bow arm clearance too. JMHO
nocams