Mammut's warmest down jacket—The Eigerjoch Pro is an extra-warm insulated jacket for bitter-cold and extreme conditions. The Pertex Quantum Pro material on the outside of the jacket is ultra-light and extra abrasion-resistant. An additional water-repellant treatment offers extra protection in extreme conditions. RDS-certified goose down coupled with the innovative double chamber construction to keep you nice and warm and make sure there aren’t any cold spots. For even better protection against moisture, the jacket has partially taped seams and is made with water-repellant down treated and combined with PrimaLoft synthetic fiber insulation made from recycled polyester.