The material used in the legs is a rather coarse thread for nylons and the weave is looser.  This makes them "ultra sheer" as described, but that is only in opaqueness and not in tactile feel.  The legs are very long so as they fall throughout the day, there will be a wad of material at your ankles.  The coarse material does not glide under pants at all and tends to be a bit clingy.