The Rumba Dry 8. 0mm Half Rope is Petzl's light, compact option for mountaineering whether you're climbing rock or ice, and it doubles as a twin rope for multi-pitch climbs that require two ropes for the rappel. Petzl treated it with Duratec Dry to resist water dripping off ice, the dirt scattered on sandy ledges, and abrasion from rocky edges. EverFlex's thermal treatment stabilizes the core's strands to improve the belayer's grip and ensure consistent handling overtime.