After a few solid days of effort, Arc'teryx team athlete, Jonathan Siegrist sent a new line at Red River Gorge, naming it "24 Karats", and at the grade of 5.14c, it is one of America's hardest sport climbs. br br br Filmed and Edited by: Keith Ladzinskibr br br img src="" alt="Climbing Red River Gorge -24 Karats, 5.14c" title="Climbing Red River Gorge -24 Karats, 5.14c" width="150" height="90" alt="Climbing Red River Gorge -24 Karats, 5.