VAPRO Control Description Holder – COMBI Weather resistant clear plastic cover with Velcro closure Durable construction Two adjustable elastic straps keep holder on forearm Detachable elastic thumb loop for precise positioning (long version only) Available in two lengths: Short, 14.5cm (36g), Long, 19cm (42g) Want to learn how to read control descriptions? Check out this clear visual guide on IOF orienteering symbols to get started.