I purchased a number of Icebreaker garments before committing to this "piece" and I was immediately disappointed by this so-called performance jacket. First of all (and this is the honest truth), when I hold my arms straight out to my sides this jacket lifts up so much it exposes my belly button because the shoulders are cut like that of a blazer, resulting in a very restricted range of motion. This is not a good attribute for the active lifestyle. Also, unlike conventional fleece this jacket has very little stretch which only makes the poor design more evident. I'm 5'9" 160, and tried going with the medium which has always fit me in other Icebreaker tops. This jacket sports a left-sided zipper which I don't like on men's clothing. There is also an oddly prominent tuxedo butt and I don't understand the purpose of that. I get the idea of trim contemporary styling but even my family of Icebreaker lovers had nothing good to say about the fit of this top when I showed it to them and they were convinced I was sent a women's jacket by accident. It's very slim in the chest, waist, and especially the hips, yet the shoulders are quite broad and the sleeves are baggy and long. The fabric is soft next to the skin but the black exterior is a little glossier than you might expect.
For the record, I really like Icebreaker clothing and still use it and recommend it. This garment is just a very poor design to the degree that the company should never have sold any of these until changes were made. If you look at other reviews online you'll see similar complaints about this garment. I had read them prior to purchasing but my confidence in Icebreaker got the better of me this time.