Petzl Zigzag Mechanical Friction Device

The Petzl Zigzag is a mechanical prusik built for arborists climbing on a doubled rope (MRS). It replaces a friction hitch with a chain of metal links, giving precise control on descents and a consistent feel from first climb to last.

How the Zigzag works

Instead of a hitch, the Zigzag uses a chain of links that the rope weaves through. When you load it, the chain pinches the rope and holds you. Push the release handle and the friction eases so you can descend. An integrated pulley keeps the system tended as you advance the device, so slack never builds up.

Because the friction comes from metal links, not fiber, the feel stays the same as the device ages. There is no hitch cord to glaze or replace, and no changes when the cord gets wet or dirty.

The Zigzag is one of the best-known mechanical prusiks for tree climbing, and it is widely used by arborists across the world.

It also works well for long limb walks, where the integrated pulley keeps the system tight as you move out.

Zigzag vs. Zigzag Plus

The Petzl Zigzag Plus adds a swivel at the attachment point, which helps keep the device aligned when you move around the tree and reduces rope twist. The standard Zigzag is a little lighter and simpler. Both work on the same 11.5 to 13 mm rope range and both are designed for doubled-rope work. The Zigzag can also be adapted for SRS with Petzl's chicane accessory, following Petzl's instructions.

Zigzag climbing has a short learning curve. Practice descending low in the tree until your release feels natural.

The device rewards a smooth hand. Squeeze the handle gently to start the descent, and use your other hand on the tail of the rope to control speed. Jerky movements make the descent uneven.

Rope and setup

Pair the Zigzag with a rope in its listed range and with a smooth cover; 24-strand and kernmantle ropes are common choices. Use a locking connector between the Zigzag and your bridge, and a friction saver or ring setup at the anchor.

Clean the links regularly; sap and grit build up and change friction. Petzl publishes inspection steps and wear limits for the links and pulley. Compare it with the hitch-based Hitch Hiker 2 if you prefer a fiber hitch.

Climbers who switch from a friction hitch often note how consistent the Zigzag feels. That consistency helps on long workdays when you are tired and do not want to think about how the hitch is behaving.

Keep the device and rope clean; grit acts like sandpaper on the links and the rope cover.

Safety

Learn the Zigzag from a qualified instructor or under close supervision. Always test the device just off the ground before climbing. Life-support gear must meet the applicable standard (ANSI Z133 and the manufacturer's instructions), be inspected before every climb, and be used only by trained climbers.

If the device has been dropped, loaded abnormally, or shows unusual wear, retire it. Store it dry and away from chemicals.