Systeme 3A is the ingenious combination of a footloop and a chest ascender for a very efficient and quick ascent. The glass fiber reinforced rope and the Velcro tape fix the device to the knee. So the chest ascender is pushed upwards only by the leg. When using the SRT it is possible to change from the horizontal working position to the vertical ascent anytime without removing the ascender. Hands-free ascent is also possible. This system was developped by the French tree climber Christophe Capiaux. It is made for the left leg, but also works on the right leg. 

• For body height: S < 175 cm
• Rope diameter: 8–13 mm, compatible with SRT and DRT
• Provides smooth, energy-efficient and safe rope ascent
• Allows switching between horizontal working position and ascent without changing gear
• Hands-free ascent, ideal for handling tools or cutting
• Minimal configuration – no ropes, no carabiners, with simple fastening
• The knee ascent set consists of:
  1 x CAMP TURBOCHEST chest block
  1 x Velcro® strap
  1 x rope loop reinforced with a thermoplastic cover