If your unsure of which strap size to select please follow the details below to assist you.

Small fits: 60-105mm

Medium fits: 70-115mm

Large fits: 85-120mm

We advise you measure the circumference of your wrist with a tape measure. Or use a piece of strip and then measure that against a ruler. 

Please not rubber straps for the UR-100 models only come in one length, that need to be cut to size.