Among Mammut's arsenal of Crag climbing ropes, the Crag Sender Dry Rope is the skinniest and most versatile out of them all. It's triple-certified as a single, twin, or half rope so you can use it at the crag, on a multi-pitch, or for alpinism. Mammut's Dry treatment excels UI's standards for abrasion-resistance as well as water-resistance, so this rope thrives in both desert and alpine environments. Its 9. 0mm diameter is ideal for experienced belayers, and it packs small and light for taking far and wide.