I've been on a lookout for a nicely fitting running jacket all summer and returned dozens due to fitting or material issues.. But I have to say my search is over - this is the one! I love this jacket! It's super light and comfortable - doesn't restrict your movement at all, very customizable (you can let it hang loosely on the hips or tighten it to create shape) and looks great! I haven't gone out running with it yet, so can't say much about the performance, but looks promising!