Like the aquatic animals Trango named it after, the Amphibian Climbing Rope thrives in moisture riddled environments from nearby ice crags to faraway alpine routes. That's because Trango treated the core and sheathe with a Duo Dry treatment for a better performance and enhanced lifespan in frozen climates and wet weather. With an 8. 1mm diameter, the Amphibian offers lightweight, packable convenience for alpinists, and a very supple belay for intermediate to advanced belayers. The Amphibian meets UI certification for use as a half or twin rope.