The Knee Ascender Set Up uses a Chest Ascender attached at the knee on the alternate leg to which the Foot Ascender is attached. It acts as a second cam, positioned higher up the rope to hoist the climber as they thrust upwards with the second leg. It requires attachment to other components of the Knee Ascender Set Up. Chest ascenders that can be used in an SRT knee ascender set up include: Petzl Basic Ascender, Camp TurboChest, Kong Futura Body or Petzl Croll. Watch our Tutorial here on how to use the Knee Ascender Set up.