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Mammut Sphere Down Winter

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The Mammut Sphere Down Winter is a high end performance and lightweight down sleeping bag with one of the lowest pack volumes available. 

Made from extremely lightweight materials and with 680g of 800 cuin top quality European goose down, the Mammut Sphere Down Winter is a contender for being one of the lightest sleeping bags with the lowest pack volume on the market. The outer fabric is windproof and water repellent, whilst the wave-shaped chambers prevent the down from migrating. The two-layer 9-chamber construction and ergonomically designed foot areas in the 3-season versions and this Winter model ensure increased comfort, insulation and extra warmth for your feet, and a 140 cm long zipper, makes getting in and out a breeze.

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.


  • The prolightTX™ outer fabric is as light as a feather, windproof and water-repellent
  • Wave-shaped chambers prevent down slipping of the down and prevent cold bridges
  • Performance Hood with Advanced Visibility: a full view with the hood closed and very good protection against the cold
  • Enhanced comfort and insulation in foot area
  • Two-layer 9-chamber construction in winter and 3-season models ensures extra warmth in foot area
  • Revised zipper reduces risk of jamming
  • Contains textile products of animal origin (down or leather)
  • Includes compression sac and storage bag


  • Maximum body size: 182 cm
  • Inner bag length: 194 cm
  • Inner width in foot area: 50 cm
  • Construction type: Wave-shaped chambers prevent down slippage
  • Temperature limit: -11 °C
  • Comfort temperature limit: -5 °C
  • Maximum inner width: 78 cm 
  • Insulated collar: Yes
  • Main Fabric: prolightTX™ - 100% Polyamide 
  • Filling: 680g of White European goose down 
  • Fill power 800 cuin
Weight: 1050g
    Customer Reviews
    5 Based on 1 reviews
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    Filter Reviews:
      Alan W.
      United Kingdom United Kingdom
      Mammut Sphere Down Winter Sleeping Bag

      Well made product and performed up to expectation. Easy to pack and lightweight.