Petzl had the Volta Dry Climbing Rope certified for use as a single twin or half rope so we can climb crags ice big walls or mixed alpine routes with the same rope. The Volta sports a skinny 9. 2-millimeter diameter and an ultralight weight (55 grams per meter) to keep elite climbers content. Petzl treated this rope with a Duratec dry treatment to resist water dirt and abrasion and the treatment also provides better rope grip and handling in cold wet conditions. This rope also has an UltraSonic finish to bond the core and sheathe together in order to eliminate frayed ends and enhance the Volta's overall durability. Its middle mark helps us find the center of the rope for quicker descents and the ClimbReady coil lets us uncoil this rope out of its bag without big tangles.