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.