To Determine cuff Bracelet size, measure your wrist above or below the joint bone...that knob that sticks up; wherever you want the bracelet to sit. Mine measures 6 1/1" and I wear a size medium cuff bracelet.
A size Small will fit up to a 6" wrist.
A size Medium will fit up to a 6 1/2" wrist.
A size Large will fit a wrist measurement of 6 1/2" to 7".
An extra large will fit a wrist measurement of 7" to 7 1/2".
A 2XL will fit a 7 1/2" to 7 3/4" wrist, and 3XL will fit 7 3/4 to 8".