US: 6-8.5 to Europe Size 27-30
Cross-market children’s socks, tights, hosiery, leg warmers, and dance tights sizing conversion mapping 6-8.5 specifications into 27-30.

Analyzing Size Equivalence Across Markets
US: 6-8.5: Corresponds to a foot length of 20 (7.9 ), matching US shoe size 13-3, and age range 84–120 months.
Europe Size 27-30: Corresponds to a foot length of 17.5 (6.9 ), matching US shoe size 10-12, and age range 48–84 months.