I didn't check the size chart - I'm a regular Medium pretty much everywhere so I just ordered that. I'm 5'10", 155 lbs and it was huge on me. I returned it and got the Small and it fit much better, though the sleeves are still longer than I'm used to. Can't hurt in the rain, though. The jacket itself seems well constructed though I can imagine the mesh pockets wearing out or ripping pretty quickly. There's a cool feature where the jacket can be rolled up and shoved inside-out into one of the pockets and zipped up (like some reusable shopping bags) if you're trying to save space in a day pack, which I'll definitely appreciate down the line. All told it seems like a solid jacket for a good price. It's not thick btw - just a shell to keep the rain off.