These leggings are the only ones I know that look like real jeans, particularly those off-black ones.  The blue denim color ones don't look as much like jeans.  Because the material is not that stretchy, they make you look slimmer.  However, one problem is that the sizing could sometimes be wrong. I have gotten one pair labeled as size S but it turned to be an actual size M.  They do stretch and lose the shape in the butt area, but along the length of the legs, they fit so well.  Also, as mentioned by other reviewers, you can easily get holes around the pockets (from pulling of the pants) and also around the hips.  This means that they will not last forever.  I wear an XS.  After I wear them for a few times, they get saggy at the hips.  They would be fine again the next time they are washed and shrunk in the dryer.  This means that if they fit a bit tight brand new, that's fine and don't get a larger size.  Despite the flaws, I have so far gotten 5 pairs and will keep buying them until I find better alternatives.