Jumar (ascender)

Definition: In mountaineering, a "jumar" is a device for vertical progression used mainly for climbing on fixed ropes. It is a mechanical device that clips onto the rope, letting the climber ascend more easily and safely. The jumar locks in place when downward tension is applied, while it slides freely along the rope when it is pushed upwards.

Etymology: The name "jumar" comes from the Jümar brand, one of the first makers of these devices. The term has become an eponym, used to describe similar devices made by various brands, much as in Italian "gomma" is used for erasers or "piumino" for padded jackets.

Hiking notes: The jumar is essential in many forms of technical climbing, especially in high-mountain environments and in caving or glacier exploration, where long ascents on fixed ropes are common. Climbers often use the jumar to get past particularly steep or dangerous sections, or when they need to climb back up a rope after an abseil.

Technical information: Using a jumar takes a certain technique. Typically, the climber attaches a jumar to the rope and connects it to the harness with a cow's tail (longe). A second jumar can be used for the foot or another part of the body to help progress. This method of ascent is known for its efficiency and for the safety it offers in difficult conditions, allowing climbers to save energy on the way up.

The jumar has become an indispensable tool in many kinds of ascent, proving its usefulness in rescue scenarios and in situations where fast progress on a rope is vital.