The JRP Triple Roll Anklet is also known as the JRP Capri Anklet. This sock is pre-rolled and stitched into place once and then you roll it one more time to give it a neat look. The rollover area is ribbed. The sizing below is according to JRP, I think a kid could wear the sock size listed below if they're 2 shoe sizes smaller than it says. Meaning a size 17 shoe could wear a size 4-5 sock.
Sock size 0-4 is for newborn to shoe size 18
Sock size 4-5 is for shoe size 19-22
Sock size 5-6 is for shoe size 23-24
Sock size 6-7 is for shoe size 25-27
Sock size 7-8 is for shoe size 28-31