Fits like tights
I'm 5' and ~100lbs. I ordered the size 2, which seemed too small at first glance, but I was able to wear a base layer underneath them without the pants looking bulky and bunched up. The material stretches, so even though the fit is snug, the pants were comfortable. I wore them with gaiters on a couple 6 hour snowshoe/hikes at 8000 feet and felt toasty even when the wind picked up. It would be even better if the inseam were a couple of inches shorter. All in all, a satisfactory purchase and even happier that I got them at 50% off!