I was reading the post "advice needed Thermal layer" , and noted several comments about Patagonia R1 fleece. I keep seeing posts about this top, either as a base layer or a mid layer, and being a die-hard-I-wear-wool-shirts in the in the winter kinda guy, I decided to investigate.
After a bit of research, I decided to invest in one, but could not find my size. So I purchased a Mountain Equipment Polartec microfleece zip jacket, with a hood, and after just wearing it around with a t shirt underneath, I can see how it could be a great mid-layer in colder weather. Maybe, just maybe it might replace my wool shirts.