I was excited to see these on sale, as I've had my eye on them for skiing but the regular price was a bit steep. They came very quickly and I immediately tried them on in my kitchen before I even got my jacket off!! I was SHOCKED at how small they were. I'm 5'1" 95lbs and I wear size 00P or 25 pants and the XS was FAR too tight. I knew that they were supposed to be snug but I couldn't wear these for more than a few minutes. Had to return them :( I'm bummed Backcountry doesn't have any size smalls right now.
My advice, order a size up.