I gave this jacket as a gift to our sound guy over at The Complex in Salt Lake, and he's a fairly thin dude, so in the winter, he needs to have a jacket that offers the MOST WARMTH HUMANLY POSSIBLE, since his body can't really create enough to keep him toasty.
He's roughly 5'10" and very slim, and we got him hooked up with a Small. It honestly fits him perfectly as well!
This jacket offers enough length to the point that it covers his entire behind, and it's definitely not light weight in any way, but that's not what this jacket is trying to be; it's trying to be the best jacket for Arctic Adventures!
He said "It's unbelievable! I ride my longboard or bike to work every day, and this jacket breathes better than most of my merino base layers! And I mean I AM A SWEATY PERSON!"
So it keeps you toasty, while also wicking the moisture away from your body, and breathing really well.