I first bought these because I read somewhere that they were a good or better substitute for the Danskin Supplex Leggings.  I was interested in those because I read that Vera Wang lives in them.  In any case, I don't really recommend working out hardcore in these because they don't seem as breathable as true work out pants.  However, I have grown to love them for casual wear.  i wear them tucked into boots or with long sweaters and flats.