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Sea to Summit
Sea to Summit
Ap III -4 Degree Down Sleeping Bag

SKU #: pg38477


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Ap III -4 Degree Down Sleeping Bag
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Product Information


Serious expeditions require serious gear. The technology packed into the Alpine Ap III -4 Degree Down Sleeping Bag from Sea to Summit is just that. The unique 3D NanoShell™ fabric prevents moisture which has condensed on the inside of the shell from migrating back into the down – a huge benefit for expedition and serious cold-weather users. The shell also blocks the wind and repels water. 850+ fill European goose down is packed into a technical hood, a draft collar and an an oversized draft tube, and offset baffles work with the mummy cut to keep you warm in the most drastic winter temperatures. With a good sleeping pad and a bag like this, you'll get the rest you need before pushing to the summit!


  • Contoured mummy cut helps keep in warmth
  • 3D NanoShell™ is windproof and water-repellant, and prevents condensed moisture reducing the loft of the down.
  • Differential cut shell with 3D side walls
  • Offset baffles and differential cut (upper half) / reverse differential cut (lower half) help eliminate cold spots.
  • 60 / 40 fill ratio
  • Side block baffle
  • Anatomically-tapered foot box
  • Zip draft tube with anti-snag
  • Neck draft tube with dual elastic adjustment
  • Cushioned internal hood drawcord with dual adjustment
  • Two-way YKK® #5 side zip
  • Medium-sized internal zip pocket
  • Includes lightweight Ultra-Sil® compression bag, mesh storage cell, and laundry bag


Temperature Rating-4 Degrees F (EN 13537 Lower)
Insulation Type850+ Fill European Goose Down
WeightRegular - 3 lb 8 oz
Long - 3 lb 15 oz
Fill WeightRegular - 2 lb 1 oz
Long - 2 lb 3 oz

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