Petzl Knee Ascent Loop Knee Ascender

Petzl Knee Ascent Loop Knee Ascender

The Petzl Knee Ascent Loop Knee Ascender is a dedicated knee ascender assembly designed to support efficient single rope ascents in professional tree care. Developed for use with the ZIGZAG or ZIGZAG PLUS mechanical Prusik, it helps arborists maintain a smooth climbing rhythm while reducing upper body effort during ascent. Its integrated, adjustable design supports consistent performance across a wide range of climbing styles and working positions.

Efficient assistance for single rope climbing

The system is designed to facilitate upward movement on a single rope by assisting the climber in advancing the climbing system during ascent. An upper strap connects directly to the mechanical Prusik, allowing the ZIGZAG or ZIGZAG PLUS and CHICANE unit to be raised smoothly. This configuration supports controlled progress on long ascents and helps maintain efficiency when working at height using modern single rope techniques.

Integrated rope clamp and foot loop control

At the core of the Knee Ascent Loop is an integrated CROLL L rope clamp, providing reliable rope engagement and consistent upward movement. The lower Dyneema strap incorporates a foot loop that supports accurate foot placement and stable tracking on the rope. This setup is compatible with EN 1891 type A low stretch kernmantel ropes ranging from 8 to 13 mm in diameter, helping ensure dependable performance across common arborist rope systems.

Adjustable design built for professional use

The Knee Ascent Loop is quick to install and remove thanks to its connectors and adjustment buckles, making it practical for daily use on site. Multiple adjustment points allow the system to adapt to different body shapes and sizes, supporting a secure and comfortable fit throughout the climb. Supplied with an XS size TOOLBAG tool pouch, the system stays organised and ready for use. Spare parts availability supports long-term durability and ongoing professional use.

Key Features

• Knee ascender assembly designed for single rope tree climbing
• Compatible with ZIGZAG and ZIGZAG PLUS mechanical Prusiks
• Upper strap assists with advancing the climbing system
• Integrated CROLL L rope clamp for smooth upward progress
• Lower Dyneema strap with foot loop for precise foot positioning
• Compatible with ropes from 8 to 13 mm in diameter
• Designed for EN 1891 type A low stretch kernmantel ropes
• Quick installation using connectors and adjustment buckles
• Fully adjustable to suit different body shapes and sizes
• Supplied with XS TOOLBAG tool pouch for organisation