XS: 5.0" - 5.5" wrist size
S: 5.5" - 6.5" wrist size
M: 6.5" - 7.0" wrist size
L: 7.0" - 7.5" wrist size
XL: 7.5" - 8.0" wrist size
To ensure a proper cuff fit: Wrap a soft measuring tape around the wrist where the wrist-bone is located. Use the chart above to select proper size.