Our warmest down jacket for extreme conditions

Your ideal companion for expeditions, winter bivouacking or belaying on ice climbs. 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...
  • Mountaineering
  • 1013-01760
  • Denier (main material)20Dx20D
  • Weight826 g
  • CutRegular Fit
  • Extremely lightweight Pertex® Quantum Pro material with ultra-thin water-repellent coating and Diamond Fuse technology for increased weather protection and excellent abrasion resistance
  • Filled with 200 g water-repellent 90/10 goose down (puff strength: 850 cuin) for optimal heat retention
  • Taped external seams for greater heat retention and weather protection
  • MAMMUT High Reach Technology™ for unrestricted freedom of movement when climbing
  • One-hand adjustable drawstring cord with Cohaesive® stoppers for easy adjustment of hem and hood - even when wearing gloves
  • YKK Vislon® 2-way zipper for smooth operation
  • 2 backpack-compatible chest pockets with zipper
  • 2 internal pockets made from elastic mesh material
  • 2 climbing-harness-compatible front pockets with zippers
  • Wrist gaiters
  • Additional stow bag with 2 carabiner loops
  • Contains non-textile parts of animal origin (down or leather)
  • Pertex® Quantum® ProPertex® Quantum Pro uses an ultra-thin water-repellant coating for greater weather protection in extreme conditions.
  • PrimaLoft® BlackPrimaLoft® Black is the basic version of the highly effective insulating material – warm, soft and lightweight synthetic insulation without any extra frills.
  • Pertex® Diamond FusePertex® Diamond Fuse fabrics use yarns with unique diamond-shaped filaments that interlock to form a durable, highly abrasion-resistant and water-repellent fabric.
  • HyperDRY™HyperDRY water-repellant down features a unique fluorocarbon-free treatment, allowing the down to retain its superior warmth-to-weight ratio even when wet.
  • Mammut Down 850 cuinThe fill power of down is rated in cuin (cubic inches per ounce): the higher the cuin rating, the greater the wadding and therefore thermal insulation per weight.
  • Filling90% Down, 10% Feather
  • Filling 2100% Polyester
  • Lining100% Polyamide
  • Main material100% Polyamide
  • Responsible downThis product contains down and feathers sourced from well-treated animals. Collection from live birds (live-plucking) as well as force-feeding are strictly prohibited.
  • Fair WearFair Wear works to ensure fair and safe working conditions in garment factories. The non-profit engages directly with factories, trade unions, NGOs and governments to protect workers’ rights.
  • RecycledThis product contains recycled materials with uncompromised performance and functionality. Choosing recycled materials reduces the use of virgin resources and helps promote a more circular economy.
Man climbing.


Robust. Elastic. Breathable. The Eiger Extreme collection offers athletes uncompromising protection when venturing out in the most severe conditions.