Now I know why everyone raves about these pants! I've worn them twice hiking in the snow and they are the perfect tool for the job. I stayed warm and comfortable all day. I'm 5'4", 120 lbs, and the size Small fit great. I thought they were going to be way too long when I first put them on, but when I used the built in gaiter, that extra length covered the whole top of my boot. The built in gaiter did an amazing job of keeping snow out of my boots.