If you are a hard rider who works up a little sweat, you cannot be without Gore tex. I was so amazed at the difference in how comfortable you can stay. I wore my Gore Tex pullover(uninsulated shell), Sno Support Fleece jacket (I call it a shirt since it's about like a flannel shirt) and my wicking layer on my upper torso. I wore the wicking layer and my FXR Team pants. My legs were always more "clammy" feeling but the upper torso would just vent that sweat right off. This is my first time with gore tex and I'm gonna toss those FXR pants in the trash. Gore tex pant for me next year, no doubt. That stuff is amazing for snowmobiling and especially active riders. I never felt a hint of cold on my torso down to 4 deg F and even when it got up 23 deg hours later I was totally comfortable. Amazing stuff.