I have the Sitka Kelvin jacket and the Kelvin Lite Hoody. Yesterday I went pheasant hunting and the air temp was 17 degrees BELOW zero. I left the Kelvin Jacket at home as it would have been way too hot. I had on 3 layers; a synthetic short sleeve tshirt, a Sitka Core midweight long sleeve and the Kelvin Lite hoody. I was as close to perfect as you can get. Never got cold even a little bit.
I didnt read this entire thread so forgive me if I repeat something someone said! Sitka Kelvin is just plain awesome. I dont wear wool anymore because of it. Sitka's Incinerator Series might be even better! Make sure you dont have stuff too tight. Wear a neck gaiter. Dunno about the other brands, but Sitka has me convinced that Primaloft is a definite advancement in cold weather clothing.
