US: 6–8 to United Kingdom Size 13–14.5
Cross-market men’s sock conversion mapping 6–8 specifications into 13–14.5.

Analyzing Sock Size Equivalence Across Markets
US: 6–8: Corresponds to a US shoe size range of 6–8, foot length of 24–26 (9.4–10.2 ), and fit classification Standard Athletic / Form Fit.
United Kingdom Size 13–14.5: Corresponds to a US shoe size range of 13.5–15, foot length of 30.5–32 (12–12.6 ), and fit classification Extended Volume / High Stretch.