This jacket is perfect for a late summer or early fall backpacking trip when the evening temperatures drop to freezing. I would not use it for seriously cold weather. For such a light weight, it really keeps you toasty. The outer fabric blocks the wind nicely, too. I love the deep pockets, inside and out. I have a 36 bust, ordered a large, and the fit is snug if I layer the jacket over anything bulkier than a t-shirt.

great expedition piece. So much better at insulation than fleece because of the weight and because it protects from the wind. Not waterproof, but does shed water to some degree. Not for rock climbing unless you have something over it, as it is somewhat delicate.

I bought this jacket because it was very lightweight but it did not provide enough warmth for a hiking expedition in the Wind River Wilderness of Wyoming in August. I used it for layering with Patagonia Capeliene 2 and a T underneath and a Mountain Hardwear rain jacket on top. Still, I was not warm in the evenings. I was trying to keep my pack weight ultralight. But now I know that for an alpine environment, I should have picked a heavier puffy jacket.