Men's Performance Running & Functional Socks
| US Men's Shoe Size |
Foot Length (in) |
Sock Size |
| 5–7 |
9.0–9.6 |
S |
| 7.5–9.5 |
9.7–10.4 |
M |
| 10–12 |
10.5–11.2 |
L |
| 12.5–14 |
11.3–12.0 |
XL |
Women's Performance Running & Functional Socks
| US Women's Shoe Size |
Foot Length (in) |
Sock Size |
| 5–6.5 |
8.5–9.0 |
S |
| 7–9 |
9.1–9.8 |
M |
| 9.5–11 |
9.9–10.5 |
L |
| 11.5–13 |
10.6–11.2 |
XL |
Unisex Size Reference
| Sock Size |
US Men's |
US Women's |
Foot Length (in) |
| S |
5–7 |
5–6.5 |
8.5–9.6 |
| M |
7.5–9.5 |
7–9 |
9.1–10.4 |
| L |
10–12 |
9.5–11 |
9.9–11.2 |
| XL |
12.5–14 |
11.5–13 |
10.6–12.0 |
* All measurements are in inches. Measure bare foot from heel to longest toe for accuracy.
* Our performance socks are stretch engineered for a snug, secure fit. If between shoe sizes, choose the larger size.
* Fit may vary slightly by sock style: no-show, quarter, crew, and plantar fasciitis support socks.
* Left / Right specific molded construction for better arch and heel lock.
