adidas Women's Athletic Cushioned Quarter Socks (6-Pair) with Arch Compression for a Secure fit, Black/Aluminum 2, Medium at Amazon Women's Clothing store
Kids' Footwear Size Chart. Nike UK
Nike Size Chart Socks 2 - RJM Sports
Kids' Footwear Size Chart. Nike CA
How to Measure Your Foot to Find the Right Shoe Size. Nike.com