Very comfortable and silky smooth.  I like the microfiber ones as well, but got these for fun becuse I liked the color.  These are such a light pink that I can even wear them to the gym and when changing no one notices.  Much lighter weight then typical briefs, and more stretchy.  The stretchyness and lighter weight make them perfect for every day wear or for sleeping in.  I have a 35" waist and a size 6 or 7 fit perfectly.  They fit perfect in the back and have the right ammount of room upfront for a normal to above average sized guy.  I love these and so does my wife!