Produced by Grivel since 1999 • Makes it impossible to lose the ice axes • Leaves hands free • Long when required • Compact when required An elastic double sling system to avoid losing tools when climbing on rock or ice, solving the problem of modern climbing without a leash. Ultralight version for mountain use and version 2.0 with swivel Rotor for technical ice. The Double Spring is attached to the harness by a larks foot knot. The two ice axes are attached with 2 small carabiners to the holes on the spike (max 750kg). Permits easy changeovers of hands and tools. The two sections are so elastic that they don't impede any movement and allow maximum arm extension when required. The Double Spring 2.0 with Rotor attaches to the harness with the carabiner end of the Rotor. Allows for change over's without twisting the leashes.