Whether you're hanging from a portaledge 1000-feet off the ground, bivvying at high altitudes, or overnighting in familiar forests, the Phantom Alpine™ Sleeping Bag is there for you through thick and thin. Made with an ultralight yet highly durable Pertex® Quantum Pro Diamond Fuse shell, packed with RDS®-certified down insulation, this bag gives you the uncompromising benefits of both weatherproofness and compressibility, making it optimal for climbs when every inch of space and gram of weight matters.