Sea to Summit Alpine AP II
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By using the highest quality 850+ European down fill, Sea to Summit was able to get the Alpine ApII down sleeping bag under 3 lbs, an impressive feat for a full-feature winter mountaineering bag. Contoured mummy shape is cut with a fitted hood, broader shoulder and large chest to maintain thermal efficiency and to accommodate extra layers in cold conditions Differential allows lining to conform to your body without overlaps or gaps to eliminate cold spots Offset baffle construction allows down to maintain full loft and minimize loss of heat through the seam lines Side block baffle technique allows a 60-40 (top-bottom) fill ratio keeps top down uncompressed and you warmer Lightweight 3D NanoShell(TM) shell uses Nano Durable Waterproof Repellent (DWR) to provide a high level of water repellency while 3D Barrier promoting fast evaporation to keep humidity from affecting down loft Anatomically tapered foot box accommodates the natural position of the feet and is roomy enough for liners Soft touch lining is down proof by construction, highly breathable and durable Oversized neck collar, draft tube, and cushioned internal hood seal with dual adjustments keep drafts out Anti-snag zipper system uses a high-density poly cloth hidden in the draft tube for smooth, snag-free zipping Full length, two way zipper side and foot zip allow not only infinite ventilation, but conversion from a traditional mummy to a flat duvet YKK #5 zippers allow this bag to unzip from the top and bottom for ventilation or to be used with another Sea To Summit bag (Trek, Traverse, and Alpine) of any size to create a double bag Medium sized internal pocket is great for storing electronics to preserve battery life in cold conditions Ultra-Sil(R) compression sack packs down from 15L to 5L Compression sack, mesh storage sack, and laundry bag included Max user height recommendations - 6'0'' Long - 6'7''
Extreme cold has no match for you with Sea To Summit Alpine APIII -4F 850 Fill Down Sleeping Bag Built with 3D NanoShell technology that repels external moisture and prevents condensation inside to ensure that 850+ fill Ultra-Dry Down stays lofted and warm even at high-altitude 60/40 fill distributes more down on top portion of the bag for maximum insulation while anatomically tapered foot box offers generous room for movement Zippered draft tube is outfitted with the lightest and stiffest anti-snag material for smooth operation and an accessible pocket inside for stashing electronic gadgets Contoured mummy shape with an oversized neck-collar and hood-seal keep draft out and provide ultimate warmth while down proof lining offers breathability for a comfortable sleep No more cold spots even when you're tossing and turning around with Sea To Summit Alpine APIII -4F 850 Fill Down Sleeping Bag
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. High loft, premium 850-fill-power European duck down offers superb warmth with minimal weight; Ultra-Dry Down(TM) 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 5degF, 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.
Even with all its insulating awesomeness, down is pretty much worthless when wet. That's why the Sea To Summit Alpine ApII 5-Degree Down Sleeping Bag uses 3D Nano Shell to stop both external and internal moisture, because even water vapor produced by your body while you sleep can be a dampener. And the miraculous 850-fill Ultra-Dry Down repels moisture to retain loft that will keep you warm on extended trips during the coldest months. Baffled construction, cushioned hood, and zipper and neck draft tubes further ensure head-to-toe comfort.