You won't notice the Mountain Hardwear Men's Phantom Hooded Down Jacket packed away when you're hiking into the alpine, but you will notice it missing when you wake up in high altitudes. Morning's frozen dew might keep you cowering in your sleeping bag without this jacket's lofty 800-fill down insulation. An 800-fill rating is one of the loftiest out there, which means this big puffy compresses small and maintains a surprisingly light weight for how warm it is. As if that wasn't appealing enough, Mountain Hardwear treated the down with Q. Shield for hydrophobic properties that retain the puff's lofty warmth in moisture-riddled environments. All of these attributes situate the Phantom as Mountain Hardwear's warmest climbing oriented midlayer.