I thought it was the shoe size but it isn't. I think the size of the sock should match the size of the sock. I bought a size 8-9 thinking it would fit my 3 year old. But this is more for 7 years. I will keep them for myself because she will grow in them, but I have to find something else because these socks are not the right size for her. Nice socks and very cute.
Thermajane Girl's Cozy and Comfy Thermal Underwear Long Johns Set with Fleece Lining
46 Review
Pack Athletic Performance Basketball Drawstring Girls' Clothing
48 Review
C9 Champion Girls Supersoft Bright Girls' Clothing and Active
46 Review
Amazon Essentials Little Short Sleeve Leotard Girls' Clothing for Active
61 Review