These are the only socks my daughter will wear. She has sensory issues and HATES seams in socks. We have the XS, S, and M sizes now. Theres only a slight difference in size between XS and S, but theres a HUGE jump between S and M. Im going to keep them because shell grow into them eventually, but its goigng to be a long time. I wish there was a small-and-a-half size lol