“Montbell Thermawrap”
I have something similar. I have the Thermawrap Action:
http://www.montbell.us/products/disp.php?cat_id=94&p_id=2301224 I have a men’s size med. I’m 5’8 145lbs.
I like the Action Thermawrap a lot. It is warmer than 300-weight fleece, lighter than fleece, packs smaller than fleece, AND almost breathes just as easily as fleece though it blocks wind pretty good. Most of the breathing is done through its side panels. I use it backpacking and biking for 30-50F weather. A little bonus I like is its thumb holes. This means I can wear a short glove and the sleeve will always stay tucked in the glove. It also has an elastic waste to keep drafts out.
I think it’s a little tougher than my down jackets; I have a WM Flight and a Montbell ‘U.L.DOWN INNER JACKET’
I take a down jacket when I need to cover a bigger temperature range in one trip. For example I take my WM Flight for 20F-60F weather.
My montbell down inner jacket is probably similar to your request of the montbell EX Jacket. That EX jacket is lighter probably because it uses 900 fp down. So I would suspect it would keep me warm from 30-60F. Also the down jacket breathes very well; I’m talking Montbell and WM here. Other down jackets I have tried do not breath well.
For 0F weather, I layer my Thermawrap underneath my WM Flight (size L).
Good luck on your decision. Those are nice jackets.
-Barry