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The Phantom Alpine Down Jacket is Mountain Hardwear's warmest insulated jacket for mountaineering and backpacking. 800-fill down holds in our body heat and packs down small, thanks to its premium loft, while the Pertex Quantum Diamond Fuse shell provides a lightweight but abrasion-resistant barrier against rips, tears, and snags. The Phantom Alpine jacket stuffs easily into its own pocket with an internal carabiner clip loop for convenient carrying outside our pack or harness.