For our elbow length gloves, we take a measurement for your forearm fit. To take your forearm fit measurement, hold your arm outstretched and pass a tape measure around your forearm at the broadest point. The resulting measurement, in inches, is your forearm fit.
For our Opera length gloves, we also take a measurement for upper arm fit as well as forearm fit. To take your upper arm fit measurement, hold your arm outstretched and pass a tape measure around your bicep at the mid point - the resulting measurement, in inches, is your upper arm fit.
To convert centimetres to inches, divide by 2.54 - e.g. 20 centimetres = 7.9 inches