I am very pleased with this purchase as I believe that for three pairs you will be hard pressed to find a better price. I have worn these socks for 8 to 10 hours at a time (sitting, standing, and walking) and never once had a problem with them rolling or falling down, but at the same time they did not cut off the circulation to my feet either. Very comfortable and you honestly will forget you are wearing them. The brown pair are about medium opaque while the black pairs all resemble traditional socks (fully opaque). I highly recommend them for anyone looking for a good value in trouser socks.