Don't have a measuring tape? Take a flexible object (ideally a string or a strip of paper) and place one end on any point at the bottom of your wrist.
Pull it around the circumference of your wrist until it meets the first point, without any allowance. Mark that point with a pen.
Measure the length between the end of your measuring object and the mark with a ruler. For a slightly looser fit, select a size 0.5cm larger than your snug measurement when placing your order.
Average circumference for males: 16.5 to 17.0cm