You just answered in the last what I was about to ask next; the warmth. So you don't need anything underneath them? Like another layer?
I usually have Under Armour 2.0 underneath all my snowboard clothes. And I'll start sweating after a few runs and have to open the vents a little. I run a little hotter than most though. I'm probably going to get lighter thermals since I don't want to open up the vents and get wet. To compare I find the Crowleys to be warmer and definitely dryer than some some cheap Burton pants I got on clearance at REI one year (non gore-tex).