Sterlings original Nano was a perennial team favorite; the default sport climbing rope for performance climbers. Certified as a single, half, and twin rope the Nano IX is lean, mean and versatile: perfect for sport routes, ice, or mixed conditions. Available with new DryXP treatment, UIAA Certified Water Repellent. NOTE: Due to the Nanos small diameter, it is recommended that it only be used by experienced climbers and belayers and NOT for top-roping or working of routes. It is critical that proper belay devices be used and extreme caution should be taken.