I purchased the Medium for a shoe size 6-7.  I expected it to be tight so it would stay on while dancing, but it is a bit too snug.  My daughter struggled to get them on the first few times.  I did not have time to exchange it so we kept it.  If, over time, it stretches out a bit she may get to use it next year.  Time will tell.  Besides the size issue the pad is great and she really enjoyed dancing in them.  Some of the girls in her class have more expensive pads but they all do the same thing.  I expect this one to last just as long as the others.