There are arm boards (quarterback wristbands) out there, but we wanted one that was simple and comfortable for PRS competitions and hunting - the H.A.P. (Hopes And Prayers). This single window arm board has 2 adjustable elastic straps to fit your arm and keep it in place. It is also backed with spacer mesh - the same thing on the padding of your backpack to let air pass through. Each armband comes with one package of 200 3" x 5" index cards.