I love CK Micro Modal underwear so I thought I would give these pj pants a try.  They're very comfortable and are lightweight so that you don't feel like you're wearing much of anything.  The fabric is just like that in Micro Modal underwear.  You can even wear them under pants like you might wear long johns, although they are not tight like long johns.  Really they're better for sleeping or for those Saturdays when you don't feel like changing out of your pajamas but just want to lounge around the house all day.  Definitely have a sexier look than most pj pants.