More info: www.petzl.com/ZIGZAG
ZIGZAG is a mechanical Prusik for arborists. It is designed for maximum precision and efficiency during any movement: going to the end of a branch and returning to the trunk, switching quickly from ascent to descent, pendulums, re-descending to the ground... So it optimizes the arborist's physical effort. ZIGZAG is very easy to get used to because it is handled the same way as a classic Prusik pulley system.