Energy drinks will slow you down in the long run, but the Edelweiss Energy 9. 5mm Unicore Climbing Rope lightens your pack to give you an extra oomph when you reach the crux pitch. Its skinny 9. 5mm diameter accommodates the compact convenience that long approaches call for. Edelweiss bonded the Energy's sheath to the core to eliminate sheath slippage and ensure long-lasting durability.