i got this jacket to run in winter temperatures - and it is perfect! It breathes well but insulates perfectly (down to the 20s in January) with a thin underlayer. (I did originally order the Medium, my usual size, but it was too tight with a layer underneath, so I got the Large - I'm 5'4 and 135 with 34C to smuggle) The length is great, the sleeves are perfectly fitted. The Quick Dry is true to advertisement. My only complaint is that the breast pocket is too loose and my iphone bounces around in it. The color is a bit pinker than the photo - but I love it!