Smartwool Sock Size Chart

Size US Men
US Women  Euro UK
Small 3–5.5  4–6.5 34–37 2–4.5
Medium 6–8.5 7–9.5 38–41 5–7.5
Large 9–11.5 10–12.5 42–45 8–10.5
XL 12–14.5 N/A 46–49 11–13.5