such a sick jacket. It kept me perfectly warm today in about 10 degrees with 30mph winds, so the wind chill was definately below zero. All I wore under it was a shirt and in fact i found myself starting to sweat a few times during the day. However the best thing about this jacket is its versatility. On warmer days you can just open the vents(which run from your wrist all the way down the side of the jacket) and stay perfectly cool. It also has a removable sweater that you can take out if it gets to be really hot, even though i can't figure out how to do this. Its also got tons of pockets, including a pass and ipod pocket. The waterproofing is also sick because i wore it about a month ago in wet snow and while all my friends were complaining about getting wet I was perfectly dry. So anyway this jacket is a little pricey, but totally worth the money in my opinion because it has pretty much everything that you could really want in a jacket.