Sterling Duetto 8.4 mm XEROS is a top-level climbing half rope, also approved as a twin rope! Super versatile, it allows you to give your best on trad and sport long routes, but also on ice climbing.Thanks to its 8.4 mm diameter and its dynamic characteristics, it is the best you could wish for to tackle important and demanding run outs! Reliable and durable, it also has an exceptional tactile feel. Smooth and sliding, it makes referrals easier and allows a better and more precise safety.Its qualities are not finished! Sterling's exclusive XEROS technology takes the Dry rope concept to another level. Unlike other treatments that make only the outer sock waterproof, Sterling has developed an innovative production process that allows you to treat every single fiber that makes up the rope, from the core to the outer sock. In concrete terms, this translates into safer and more performing ropes in humid conditions, which leave you the freedom to focus on climbing without worrying about your safety.