Simply wrap the webbing strap around your wrist or arm and secure with the velcro fastening, because of the velcro it is adjustable so one size fits all. There is a marine stainless steel d ring on the webbing so you can attach valuable items so they are secure and close to hand. Consist of 25mm black nylon webbing with our label on, 25mm stainless steel d ring and velcro that is stitched with industrial nylon thread for strength and salt water tolerance. Manufactured in our own workshop for a quality item.