Double Rope Technique, or DRT, is a traditional method of tree climbing where the climber uses a rope that is anchored over a branch. The rope's two ends hang down, forming a 'V' shape. The climber ascends and descends by using one end of the rope while a friction hitch or mechanical device on the other end provides a way to climb. This technique involves the rope moving (or "running") over the branch union as the climber moves up or down.