Beal's Joker is a triple-certified climbing rope that you can use as a single line for demanding sport routes, a twin rope for multi-pitches, and a half rope for alpine routes. Its skinny 9.1mm diameter is ridiculously light and thin for packing small, reducing rope drag, and providing a performance ideal for advanced climbers. This version of the Joker features Beal's best. Unicore bonds the sheath to the core to eliminate sheath slippage and enhance longevity, and Golden Dry treats the core and sheath with hydrophobic water-resistance that practically eliminates water absorption. It's UIAA certified for water-resistance in alpine environments, and the treated sheath adds abrasion-resistance for extra durability.