They kind of have a Goretex feel to them and make a little "swishy" sound when walking. Stopped noticing it when running. Great at keeping out the cold wind. No chaffing. Soft inside. I got a size S. I am 5'6" and 120 lbs. A little long so a great tight if you are taller.
These pants are excellent for running, cycling and walking. I've used it on both winter running and cycling and it's added warmth and safety to me.