This is an amazing hoodie. Fits like a glove and is amazingly warm for its' weight. (5'9", 140 lbs, thin, wiry. Ordered a small.)
When you are moving, this and a t-shirt are fine, even in the 40's.
It's thin enough to wear under anything. A perfect layer that doesn't restrict.
I especially like the zipper setup. It zips up slightly off center so it isn't jabbing my Adam's apple or ripping hair out of my chin when I'm moving.