Smooth and silky, as long as they are of a quality brand and not the street corner, supermarket variety. They're usually pretty cheap. It also helps to find ones that fit correctly. Other than that, they feel nice , make my legs look good and put a finished look to any outfit.
The only thing that annoys me about them is they either ride to far up on me or they keep falling off it just feels like a very thin long socks that join together. Sometimes it's uncomfortable when you eat too much.