MB UL Shell Jacket

Can't give you any numbers, but I do own one of these and I'd say it's not as warm as 100 wt fleece or expedition weight undies, but warmer than medium weight t-neck when worn as a warmth layer. And warmer than the 100 weight if worn as the outer layer in the wind. I like it. Mine is I think men's large, and weighs 4.9 ounces. The lining is very thin mesh which is comfortable against the skin, you could wear it as a base layer if you wanted to. I don't have anything that's as warm at that weight, but I don't think of it as a "jacket", more like a warm shirt.

THIS THREAD might help you

Great link! Hadn't seen that one before but loving the first post.

Thanks!