Whether it's a limit testing onsight attempt, a 5. 14 redpoint, or a wandering alpine climb, the Mammut Serenity Dry Climbing Rope is your secret weapon for success. With a diameter of just 8. 7mm and weight of just 51 gramsmeter, the Serenity boasts one of the lightest and thinnest designs of any single rope available today. It's also fully certified as a half and twin rope, making it suitable for long alpine routes, and it has Mammut's Protect dry sheath and core treatments, so it won't absorb water on alpine, ice, or mixed routes.