This is my favorite jacket aside from the ones I snowboard in. A couple nights leaving work at 4am when it was 0 degrees in Salt Lake I would be brushing off my car and waiting for it to warm up, and I was pleasantly surprised that I didn't feel all that cold in this thing! The hood is awesome, you can cinch it down and you can feel it hug your ears...almost acting like earmuffs too. Packs really small in its stuff sack and is super light. I'm 6' and about 165 lbs and went with the XL. I like my stuff a little bigger so I can wear hoodies under it, and this fits perfectly.