US: 10–12.5 to Europe Size 33–34
Cross-market women’s sock and hosiery conversion mapping 10–12.5 specifications into 33–34.

Analyzing Women’s Sock Size Equivalence Across Markets
US: 10–12.5: Corresponds to a foot length range of 25.5–27.5 (10–10.8 ), US shoe size bracket of 10–12.5, and fit classification Comfort Stretch / Ankle Grip.
Europe Size 33–34: Corresponds to a foot length range of 20–21.5 (7.9–8.5 ), US shoe size bracket of 3.5–4.5, and fit classification Snug / Petite Fit.