The Harken Ninja Foot Ascender is a lightweight, boot-mounted rope ascender designed to make rope climbing faster, easier, and more efficient. Utilizing the strength of the user's legs, the Ninja Foot Ascender reduces upper-body fatigue and improves climbing performance for rope access technicians, rescue professionals, arborists, and work-at-height personnel.

Constructed with a durable aluminum housing and stainless steel dual cams, the Ninja features an innovative low-drag design that allows for smooth rope advancement with minimal resistance. Unlike traditional foot ascenders that rely on aggressive teeth, the Ninja uses a transverse ribbed cam system that grips securely without damaging the rope. Its patented dual-cam mechanism applies pressure evenly from both sides of the rope, delivering superior holding power while preventing accidental kick-outs.

The Ninja is also uniquely designed for use on either foot, providing maximum versatility and convenience. With compatibility for ropes ranging from 8–13 mm and a maximum rated load of 150 kg (330 lb), it is an excellent addition to modern rope access and rescue systems.

Features

• Lightweight boot-mounted ascender for efficient rope climbing
• Utilizes leg strength to reduce fatigue and improve climbing efficiency
• Dual-cam system prevents accidental rope release or kick-outs
• Can be used on either the left or right foot
• Low spring-force design minimizes rope drag for smoother ascent
• Transverse ribbed cam grips securely without damaging rope fibers
• Dual cams apply pressure evenly to both sides of the rope
• Durable aluminum housing with stainless steel cam construction
• Ideal for rope access, rescue, arborist, and work-at-height applications
• Compact, lightweight design enhances mobility and comfort

Specifications

• Manufacturer: Harken
• Product Name: Ninja Foot Ascender
• Product Type: Foot Ascender
• Weight: 175 g (0.4 lb)
• Dimensions: 83 x 74 mm (3.3 x 2.9 in)
• Rope Diameter Compatibility: 8–13 mm (5/16–1/2 in)
• Housing Material: Aluminum
• Cam Material: Stainless Steel
• Maximum Rated Load: 1.5 kN (330 lb / 150 kg)
• Foot Compatibility: Left or Right Foot