Our warmest down jacket for extreme conditions For expeditions, winter bivouacking or at the belay station when ice climbing; the Eigerjoch Pro is a particularly warm insulating jacket for very cold and extreme conditions. The Pertex® Quantum Pro outer material of the jacket is ultra-light and at the same time particularly abrasion-resistant. An additional waterproof treatment offers increased weather protection in extreme conditions. The RDS-certified goose down filling, together with the innovative double-chamber construction, ensures cosy warmth without cold spots. A water-repellent coating on the down, combined with PrimaLoft™ synthetic fibre insulation made from recycled polyester, and the partially taped seams provide even more efficient protection against moisture from the outside. A wide range of features and pockets as well as a separate pack bag round off the features.