United Kingdom Size 15–17.5 to US: 8.5–10.5
Cross-market men’s sock conversion mapping 15–17.5 specifications into 8.5–10.5.

Analyzing Sock Size Equivalence Across Markets
United Kingdom Size 15–17.5: 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.
US: 8.5–10.5: 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.
Other Conversions to US: 8.5–10.5
United Kingdom Size 3.5–5 → us-8-5-10-53.5–5 to us-8-5-10-5
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United Kingdom Size 5.5–7.5 → us-8-5-10-55.5–7.5 to us-8-5-10-5
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United Kingdom Size 8–10 → us-8-5-10-58–10 to us-8-5-10-5
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United Kingdom Size 10.5–12.5 → us-8-5-10-510.5–12.5 to us-8-5-10-5
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United Kingdom Size 13–14.5 → us-8-5-10-513–14.5 to us-8-5-10-5
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United Kingdom Size 15–17.5 → us-8-5-10-515–17.5 to us-8-5-10-5
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