The concept is wonderful, it is like a slip for your slacks.  They give you an extra layer for warmth (I wear them all winter long) and they are perfect for unlined pants (espcially scratchy wool).  I have worn these for years.  My current pair is about eight years old and is starting to look a little worn, so I thought I better get some more before they are no longer available.  These are the same company as the ones I have, but they have made the bottom (where the lace starts) very narrow (an inch smaller than my current pair), they barely fit over my calves, and they get hung up and twisted if I am wearing socks.  (I have thin legs, so big calves are not the issue.)  I'm guessing that it is a manufacturing quality issue - it all depends on the individual sewing the seams - my pair just didn't leave as much room.  Luckily I sew, so I can work on them, but it is not something I should have to be doing, thus the three stars - otherwise it could have been a five star review.