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The Mammut Eiger Speed IN 1/2-Zip Hoodie utilizes a blend of incredibly lightweight insulation and a super packable construction to create a midlayer perfect for fast-paced tours at high altitudes. The pullover jacket is filled with body-mapped PrimaLoft Gold Active insulation through the arms and hood, with 900-fill DRYDown insulation surrounding our core to maximize warmth. The Pertex Quantum Pro shell material repels light amounts of moisture, and the whole jacket packs down small in our pack so we can break it out when we need it most.