Unisex Running Socks
| Sock Size |
US Men's Shoe |
US Women's Shoe |
UK |
EU |
Foot Length (in) |
Foot Length (cm) |
| S |
3–5.5 |
4.5–7 |
2.5–5 |
34–37 |
8.50–9.25 |
21.5–23.5 |
| M |
6–8.5 |
7.5–10 |
5.5–8 |
38–41 |
9.25–10.00 |
23.5–25.5 |
| L |
9–11.5 |
10.5–13 |
8.5–11 |
42–45 |
10.00–10.75 |
25.5–27.5 |
| XL |
12–14.5 |
13.5–16 |
11.5–14 |
46–49 |
10.75–11.75 |
27.5–30.0 |
| XXL |
15–17 |
16.5+ |
14.5–16.5 |
50–52 |
11.75–12.75 |
30.0–32.5 |
Women's Running Socks
| Sock Size |
US Women's Shoe |
US Men's Shoe |
UK |
EU |
Foot Length (in) |
Foot Length (cm) |
| XS |
3–4.5 |
1.5–3 |
1–2.5 |
32–34 |
8.00–8.50 |
20.5–21.5 |
| S |
5–7 |
3.5–5.5 |
2.5–5 |
35–37 |
8.50–9.25 |
21.5–23.5 |
| M |
7.5–10 |
6–8.5 |
5.5–8 |
38–41 |
9.25–10.00 |
23.5–25.5 |
| L |
10.5–13 |
9–11.5 |
8.5–11 |
42–45 |
10.00–10.75 |
25.5–27.5 |
| XL |
13.5–16 |
12–14.5 |
11.5–14 |
46–49 |
10.75–11.75 |
27.5–30.0 |
Compression Running Socks & Calf Sleeves
| Size |
Calf Circumference (in) |
Calf Circumference (cm) |
US Men's Shoe |
US Women's Shoe |
| S |
12.5–14.5 |
32–37 |
4–7 |
5.5–8.5 |
| M |
14.5–16.5 |
37–42 |
7.5–10 |
9–11.5 |
| L |
16.5–18.5 |
42–47 |
10.5–13 |
12–14.5 |
| XL |
18.5–21.0 |
47–53 |
13.5–15 |
15+ |
Kids' Running Socks
| Size |
Age |
US Child Shoe |
EU |
Foot Length (in) |
Foot Length (cm) |
| XS |
2–4Y |
6–9 |
22–26 |
5.50–6.50 |
14.0–16.5 |
| S |
4–6Y |
10–12 |
27–30 |
6.50–7.25 |
16.5–18.5 |
| M |
6–8Y |
13C–1Y |
31–34 |
7.25–8.00 |
18.5–20.5 |
| L |
8–10Y |
2Y–5Y |
35–38 |
8.00–9.00 |
20.5–23.0 |
Sock Height Guide
| Style |
Height |
Best For |
| No-Show |
Below ankle bone |
Racing, speed work, hot weather |
| Ankle |
At ankle bone |
Daily runs, gym, casual wear |
| Quarter |
Just above ankle |
Trail, training, everyday runs |
| Crew |
Mid-calf |
Cold weather, trail, recovery |
| Over-the-Calf |
Below knee |
Compression, recovery, cold weather |
* All measurements are in inches unless otherwise noted. Sock sizes are based on shoe size and foot length.
* Measure your foot in the afternoon or after a run, standing, from heel to longest toe.
* For compression socks and calf sleeves, measure calf circumference at the widest point. If between sizes, size up.
* Running socks should fit snugly with no wrinkles or loose fabric. Wrinkles can cause blisters.
* If between sizes for regular running socks, choose the size that matches your shoe size. For more compression, choose the smaller size; for more room, choose the larger size.
* Sock height is personal preference. No-show for race day, crew for cold weather or trail.
* Wash inside out in cold water. Do not use fabric softener. Air dry or tumble low.
* Actual fit may vary by style, cushioning level, and fabric stretch.
