Very elastic.  Color doesn't fade with stretching.  Washed 8 times so far (follow cleaning instructions) and no problems there.  Keeps the same shiney & stretchiness.  No shrinkage noted, either.  If you have a flattering shape, they will look great.  However, no butt-lifting or shaping here.  Still, I think it will look great regardless.

P.S.  Wife says these should be add to most women's leggings collections.  And a must for the holidays.  I agree.