Sea to Summit  Alpine ApII Sleeping Bag

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Designed for high altitude overnights, the Sea to Summit Alpine ApII down sleeping bag keeps your nights warm when trekking the Himalayas or touring the Alps hut to hut.

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Features

  • High loft, premium 850-fill-power European goose down offers superb warmth with minimal weight; Ultra-Dry Down™ water-repellent treatment protects down from moisture
  • Ultra-Dry Down is a water-repellent polymer treatment applied to the 850-fill down; Ultra-Dry Down retains 60% more loft and absorbs 30% less moisture than untreated down
  • With a European Norm (EN) lower-limit rating of 5°F, the ApII bag will help keep you warm in all seasons, including winter
  • Shell fabric is constructed of a 20-denier ripstop fabric treated with a Durable Water Repellent and a non-woven silicone encapsulated fabric
  • Innovative shell manages condensation, moving moisture vapor outward through down and siliconized barrier; shell repels water and protects the loft of the bag
  • Lining is a breathable, durable 20-denier polyester fabric with a soft touch
  • Contoured mummy shape is cut with a fitted hood, broad shoulders and large chest (to accommodate layering of clothes); generous room around knees ensures comfort when turning
  • Upper side of bag is differentially cut so that the inner layer is smaller than the outer layer; this creates a consistent thickness of insulation and helps prevent cold spots
  • Lower side is cut in reverse so that the inner layer is larger than the outer layer; this allows down to loft up, filling spaces around body in warmth
  • Oversize draft tube backing the 2-way zipper keeps the warmth in and the cold out; zipper is backed by stiff, antisnag tape for smooth operation
  • Anatomically tapered foot box allows feet to rest naturally; it also preserves loft and allows down to drape close to feet for warmth
  • Oversize collar drapes comfortably over neck and shoulders, sealing out drafts; dual elastic adjusters
  • Preventing cold air from seeping in, offset baffle construction allows the goose down to remain fully lofted and keeps it from shifting
  • Interior zipper security pocket is great for stowing small essentials, alleviating middle-of-the-night fumbling and preserving battery performance in cold weather
  • Sea to Summit Alpine ApII bag comes with a Ultra-Sil® compression sack, an oversize mesh storage cell and a large cotton sack
  • European Norm (EN) is an independent third-party temperature rating, allowing accurate comparisons across brands with other EN-rated bags

Imported.

Temperature ratings are intended as a guideline to help you compare products, rather than a guarantee of warmth, since many different factors contribute to your comfort while you sleep. Backpacking bags are typically rated for temperature according to an independent testing protocol—currently International Organization for Standardization (ISO) 23537, though some older items followed European Norm (EN) 13537. Testing is based on a person wearing one base layer and a pair of socks, sleeping on an insulated surface with a minimum R-value of 5.38.

Each bag then gets 2 ratings: the Comfort rating is the lowest temperature at which the bag will keep the average "cold sleeper" comfortable, and the Lower Limit rating is the lowest temperature at which the bag will keep the average "warm sleeper" comfortable. Some brands determine their own temperature rating by aligning to the Comfort rating for women’s bags, to the Lower Limit rating for men’s bags, or somewhere in the middle for nongendered bags.
View all Sea to Summit Backpacking Sleeping Bags

Technical Specs

Best Use

Backpacking

Tested Lower Limit

5 degrees (F) - EN

Tested Comfort

16 degrees (F) - EN

Temperature Rating (F)

5 degrees (F)

Temperature Rating (C)

-15 degrees Celsius

Shell

Polyester

Insulation Type

Down

Fill

850-fill goose down

Lining

Polyester

Sleeping Bag Shape

Mummy

Stuff Sack Size

8 x 18 inches

Stuff Sack Volume

15 liter

Gender

Unisex

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