Update: Large is just a longer part of the foot, but the same calf size as average. It's a tight grip over the shin guard with little room to shrink. Unfortunately we have to look for another sock. The medium size was perfect for my daughter but based on other reviews I knew to expect shrinkage so we're going back for the larger to make sure it fits her shin guards for the season. My daughter wears size 2 girls shoes and size 8-10 girls clothes. This sock definitely runs small.
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