I read the reviews on both the low socks and the crew socks carefully before ordering, as my daughter is also very picky about sock seams. The crew socks have a tiny string across the toes but the socks are so thin that it doesn't bother her.  However the low cut socks are much thicker, and as a result, the seam is quite noticeable. To make it worse, the socks slipped down inside her shoes, so they are pretty much useless.