Gymboss ARMBAND Made of a durable elastic with a velcro closure. It is used to hold your Gymboss Interval Timer on your bicep. Elastic velcro stretches to fit any bicep, calf, etc from 9-19 inches. NOTE: There is also a Gymboss WRISTBAND. The Armband and Wristband look identical, but are two different sizes. Width: 1 inch wide.