Nice and Comfy
I am about 5'8" and 135 and bounce around a small and XS for Patagonia. I got a small because it is a slim fit, but is not compression. Fits well. The Length in torso is nice, Sleeves are a tad long. Zipper is nice and does not get caught on neck like some other pieces do. really like how seams are on top of arms and not in rubbing areas. Good weight, can use it as first layer or good second layer.