I love these pants! I'm 5'10", 145 lbs with a slim athletic build. As other reviewers have mentioned, these pants are cut on the slim side. I have athletic thighs but because of my height these pants still work for me. I love the side vents. They are perfectly placed and dump heat fast. These pants allow me to move fluidly down as well as up the mountain. The outer layer is super waterproof and durable in strong wind as well as flat out rain. I was looking for a pant with a longer inseam and while I wouldn't object to a couple more inches on these, with how strong the gaiters are they work just fine. The zippers are also super tough so I don't have to worry about a pocket accidentally opening. I feel like the medium fit me perfectly while giving me enough room to layer and still move while touring. The snaps tend to come undone from time to time so I would definitely recommend wearing a belt. If it weren't for the belt loops I would have sent these back. I know I've made a good turn when I dig into it and hear/feel my snaps pop. I talked to another friend who has the same pants and her snaps pop all the time too. So if yours pop, it might not be a sizing issue. All in all, for the conditions I ski and my build these pants are perfect.