You can rely on Trango's 9. 0mm Catalyst Climbing Rope when you plan on climbing sport one day and alpine the next. Trango had this super skinny rope certified as a single rope, half rope, or twin rope for the utmost versatility in the vertical world. The rope's Unicore construction bonds the sheath to the core to enhance performance, increase durability, and eliminate sheathe slippage. Trango treated both core and sheath with Duo Dry for reliable resistance against moisture, dirt, and abrasion. A rope this skinny should only be used by highly experienced belayers and climbers.