Chest jammer

Vertical caving terminology and methods > Personal SRT gear

Chest jammer, chest ascender, body jammer, body ascender

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A common design of chest jammer, with a twist in both attachment holes so it can be connected directly to a D-ring and chest harness.
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Chest jammer in its usual position, as part of a frog system rig.

An ascender that is connected directly to the D-ring, or to the D-ring via a maillon. The top of it is pulled upwards by the chest harness so that it slides up the rope more easily, increasing efficiency. The most popular one is a "Croll", made by Petzl. Dispite its name, it sits in front of the abdomen, not the chest. In use, it will sit a little higher, but not fully over the chest. Used with the frog system, singe system, inchworm system, and optionally with the another prusiking system.


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