The Double Spring is an elastic double sling system to avoid losing tools when climbing on rock or ice, solving the problem of modern climbing without a leash. The Rotor attaches to the harness with the carabiner end of the Rotor. This allows for change overs without twisting the leashes. The two sections are so elastic that they don’t impede any movement and allow maximum arm extension when required. Compact when required, long when required. Attention: the double spring must never be used as a self belay for the climber or to belay a companion. Its strength is limited to 200kg. The two small carabiners have a maximum resistance of 750kg and must never be used instead of normal carabiners when climbing or belaying.