This pant suprized us. They have 20K waterprofing (great!), 12K breathability (OK) and are incredibly comfortable. Sessions forgot to mention the waterproofing and breathability on the site. WTF! We found the best feature of the pants is the comfort. When we put these pants on the immediate reaction was they felt broken in allready. The fleece actually isn't just on the butt and Knees like the session. The flese runs down your quad to your mid shin. If you wear these with a 1st layer you will be very warm for a non-insulated pant. It also keeps your butt and even your unit fleece lined. There is a bevy of pockets of all sizes. The only issue with past Sessions pants is one button instead of two for the waist. Sessions makes good clothing but in the past we have had button issues. Having 2 can make the difference between going home to get a belt or staying on the hill. As far as durability is concerned the flight pant like all sessions pants will hold up well but aren't going to win any awards for long lasting pants like the burton AK line or Patagonia. That being said you get what you pay for and a little more. All in all this is a great park and all mountain pair of pants that will hold up to almost any type of condition. Well done Sessions!