These are so warm!  I thought I was being a little insane in buying full length cable knit legwarmers but I have had so much use out of them this winter.  The elastic end stays up OK, but not great.  I generally have to yank them up about halfway into my 2 mile walk to work.  They add so much warmth it's crazy.  They make wearing skirts so much easier in the winter, and I wear them over leggings too.  You can't really wear them over bare legs, though, because (1) they fall down immediately without tights or leggings to "stick" to, and (2) they are pretty scratchy.