The double rope technique reduces rope drag and increases fall protection over sharp edges, especially on routes with multiple traverses. This system also offers expedient full-length rappels. Unity is designed for classic climbers who clip protection alternately and for the extremely weight-conscious alpinist. All Maxim ropes have Endura dry treated cores. Select styles have a Double Dry (2x) treatment where the cover is coated with Endura Dry Treatment as well as the core for the ultimate in dry protection. These models carry the "2X Dry" designation on our website.