These pants are HEAVY DUTY AND packed full of features. The shell is fairly thick ballistic nylon. There's also a removable quilted thermal liner. I used to be ski instructor, and these pants are warmer than any pair of ski pants I've owned. Even without the thermal liner, this is a heavy pair of pants. Sizing is generous. I normally wear 30-32 depending on brand. I ordered a 30, and it fits great with room to cinch down or up with the waist adjustment. Includes removable suspenders. Great for cold or wet weather, but I wouldn't wear these in temps higher than 65 F even without the liner.