Trail Running & Light Hiking Shoes
| US Men Size |
US Women Size |
Foot Length (in) |
Ankle Circumference (in) |
| 6 |
7.5 |
9.2–9.4 |
9.0–9.3 |
| 7 |
8.5 |
9.5–9.7 |
9.2–9.5 |
| 8 |
9.5 |
9.8–10.0 |
9.4–9.7 |
| 9 |
10.5 |
10.1–10.3 |
9.6–9.9 |
| 10 |
11.5 |
10.4–10.6 |
9.8–10.1 |
| 11 |
12.5 |
10.7–10.9 |
10.0–10.3 |
| 12 |
13.5 |
11.0–11.3 |
10.2–10.5 |
Heavy Mountaineering Boots
| US Men Size |
Foot Length (in) |
Calf Circumference (in) |
Shaft Height (in) |
| 7 |
9.4–9.6 |
13.0–13.4 |
11.8 |
| 8 |
9.8–10.0 |
13.4–13.8 |
12.1 |
| 9 |
10.2–10.4 |
13.8–14.2 |
12.4 |
| 10 |
10.6–10.8 |
14.2–14.6 |
12.7 |
| 11 |
11.0–11.2 |
14.6–15.0 |
13.0 |
| 12 |
11.4–11.6 |
15.0–15.4 |
13.3 |
Urban Functional Fashion Shoes
| US Men Size |
US Women Size |
Foot Length (in) |
Midfoot Width (in) |
| 5 |
6.5 |
8.9–9.1 |
3.2–3.3 |
| 6 |
7.5 |
9.2–9.4 |
3.3–3.4 |
| 7 |
8.5 |
9.5–9.7 |
3.4–3.5 |
| 8 |
9.5 |
9.8–10.0 |
3.5–3.6 |
| 9 |
10.5 |
10.1–10.3 |
3.6–3.7 |
| 10 |
11.5 |
10.4–10.6 |
3.7–3.8 |
| 11 |
12.5 |
10.7–10.9 |
3.8–3.9 |
Ski Full Gear (Boots / Jackets / Pants)
| US Ski Boot Size |
Apparel Size |
Foot Length (in) |
Thigh Circumference (in) |
| 250 |
XS |
9.0–9.2 |
20–22 |
| 260 |
S |
9.4–9.6 |
22–24 |
| 270 |
M |
9.8–10.0 |
24–26 |
| 280 |
L |
10.2–10.4 |
26–28 |
| 290 |
XL |
10.6–10.8 |
28–30 |
| 300 |
XXL |
11.0–11.3 |
30–32 |
Functional Outdoor Apparel (Shell / Fleece / Base Layer)
| US Size |
Chest (in) |
Neck (in) |
Sleeve Length (in) |
| XS |
34–36 |
14.0–14.5 |
31–32 |
| S |
37–39 |
14.5–15.0 |
32–33 |
| M |
40–42 |
15.5–16.0 |
33–34 |
| L |
43–45 |
16.5–17.0 |
34–35 |
| XL |
46–49 |
17.5–18.0 |
35–36 |
| XXL |
50–53 |
18.5–19.0 |
36–37 |
Outdoor Utility & Hiking Pants
| US Waist Size |
Hip (in) |
Inseam Short (in) |
Inseam Regular (in) |
| 28 |
34–36 |
29 |
32 |
| 30 |
36–38 |
29 |
32 |
| 32 |
38–40 |
30 |
33 |
| 34 |
40–42 |
30 |
33 |
| 36 |
42–44 |
31 |
34 |
| 38 |
44–46 |
31 |
34 |
| 40 |
46–48 |
32 |
35 |
Athletic Outdoor Socks
| Sock Size |
US Men Shoe Size |
US Women Shoe Size |
Foot Circumference (in) |
| S |
5–7 |
6–8.5 |
7.0–7.8 |
| M |
8–10 |
9–11.5 |
7.9–8.6 |
| L |
11–13 |
12–14 |
8.7–9.5 |
| XL |
14–16 |
N/A |
9.6–10.4 |
* All measurements listed in inches. Measure bare feet / thin base layers for precise sizing.
* Hiking & mountaineering boots require extra toe room; we recommend sizing up 0.5–1 full size.
* Ski boots fit snug with thermal socks; pick standard size if you wear thin ski liners.
* If between two sizes, size up for layering outdoor jackets, pants and thermal base layers.
* Actual fit varies by shoe width, fabric stretch, boot liner thickness and garment cut.
