Relax your arm and measure the circumference of your forearm about 5 cm below your elbow. Use the following guide to choose your correct size:
| Size | Inches | Centimeters (cm) |
|---|---|---|
| S | 8–10 inch | 20–25 cm |
| M | 10–12 inch | 25–30 cm |
| L | 12–13.7 inches | 30–35 cm |
| XL | 13.7–15.7 inches | 35–40 cm |