Jumars for mountaineering

Jumar

— hand ascender for climbing a fixed rope: the cam with teeth grips the rope when loaded downward and slides freely upward, allowing you to quickly "step" up when used together with a foot strap and a second ascender. In mountaineering, the ascender is valued for speed and control, especially in rescue operations and on fixed lines, but it's important to remember that it is not a fall arrest device: the ascender is not designed to catch a fall like a belay device, so it is usually backed up with a separate system or a second element. Compared to a similar alternative, the prusik knot is lighter and more versatile, but in wet/frozen conditions and during long ascents, the ascender is usually faster and less "fussy" in operation. Examples include climbing fixed ropes on a wall, exiting a crevasse on a rope, ascender training, or hauling gear in a rope and pulley system as a "reverse flow."