US: 15.5–18 to United Kingdom Size 8–10
Cross-market men’s sock conversion mapping 15.5–18 specifications into 8–10.

Analyzing Sock Size Equivalence Across Markets
US: 15.5–18: Corresponds to a US shoe size range of 15.5–18, foot length of 32.5–35 (12.8–13.8 ), and fit classification Max Volume / Bariatric & Therapeutic.
United Kingdom Size 8–10: Corresponds to a US shoe size range of 8.5–10.5, foot length of 26.5–28 (10.4–11 ), and fit classification Standard Regular Fit.