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Mammut Protect Down Winter -18C (Highway)

Zip Side: Centre
Size: Regular

The Mammut Protect Down Winter -18C is for extreme activities utilising extreme innovation.

The sleeping bag for maximum comfort in extreme situations. The head and foot areas feature a waterproof membrane. More capacity inside for greater comfort. Central zipper for climate regulation. Special material to minimise noises. Down ensures a light weight and small packing volume. Protect Down Bag -18C, to sleep as comfortably as in your own bed despite extreme cold.

More Help? For further assistance on choosing your down sleeping bag, we have an article explaining fill power, the pros and cons of down over synthetic insulation and more info on caring for your bag available to view here: Down Sleeping Bags.


  • Warm collar: Yes
  • Restorative sleep thanks to a newly developed sleeping bag shape
  • Intuitive climate regulation with a central 2-way zipper
  • Comfortable, soft material in the hood reduces noise and increases comfort
  • Including deep sleep mask and earplugs to reduce light and noises
  • PFC-free DWR treatment
  • Lining made from 100% recycled polyester
  • 700 cuin fill power with ethically procured and certified RDS down
  • Easy-to-use magnetic closure on the insulation collar
  • Improved YKK zipper prevents jamming of material
  • Insulated covering along the zipper to protect from cold bridges and enhance climate comfort
  • Insulation chamber around the hood opening to protect from cold and wind
  • Drawstring for easy adjustment of the hood and insulation collar
  • Revised anatomical foot box for greater comfort without extra weight
  • Zipper garage reduces cold areas at the end of the zipper
  • Internal pocket to store valuables
  • Supplied with a packing bag
  • Supplied with a storage bag


    • User size: 180 - 195cm
    • Inner width in foot area: 60 cm
    • Maximum inner width: 80 cm 
    • Comfort temperature limit in °F (EN 13537:2012): -1 °F
    • Comfort temperature limit in °C (EN 13537:2012): -18 °C
    • Extreme temperature in °F (EN 13537:2012): -40 °F
    • Extreme temperature in °C (EN 13537:2012): -40 °C
    • Comfort temperature in °F (EN 13537:2012): 14 °F
    • Comfort temperature in °C (EN 13537:2012): -10 °C
    • Construction type: H-Chambers - prevent down slippage
    • 30D Nylon Face Fabric - 100% Polyamide
    • Filling: 950g of 90% Grey duck down |10% Grey duck feather
    • Fill power 700 cuin
    • Packed size: 29 x 30.5 cm
    • Weight: 1700g

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