This is a funny midlayer that I bring along with me everywhere but don't always use. It's very thin and kind of windproof. When it rains, it's sort of ok for awhile and then it gets wet but it does keep you warmer. It's good in moderate weather when you want something over your baselayer to cut the wind, but not too much. I have a version from two years ago and it's also boxy (which has been improved) and very unflattering. It's not very helpful in cold weather. I do really like the chest pocket and it's good when you just want something over your arms.