Exceptionally well made, highest quality. Heavy duty but on the warm side. So think winter activities in cold temps... You would not want to wear these summer hiking for example as the materials are thick and warm. One other note- they do not have a zipper at the ankle, so no room for ski boots as they are somewhat narrow at the ankle cuff. They fit over tall hiking boots well. Having said having said that, they are excellent for any cold weather activities like hiking, ice climbing, X-country skiing (low boots), etc. I guess if you wore gaiters, you could use them with BC ski boots (but test to see if your gaiters will fit over you ski boots to be sure). But then, you'd be wearing gaiters over your ski boots. Bottom line, these are some of the best pants ever on par with any top brand in the world. If they made an equivalent summer weight pant, I'd own a couple pairs of those too.