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  • Insulated with high-loft 650-fill-power duck down for warmth, light weight and compressibility; Ultra-Dry Down™ water-repellent treatment protects down from moisture
  • Ultra-Dry Down is a water-repellent polymer treatment applied to the 650-fill down; Ultra-Dry Down retains 60% more loft and absorbs 30% less moisture than untreated down
  • With a European Norm (EN) comfort rating of 28°F, it will help keep you warm in cool temps
  • Shell fabric is constructed of 2D PermaShell™ technology, a high-density weave, 33-denier fabric treated with a durable water repellent (DWR) finish
  • Shell material is highly vapor permeable and downproof
  • Lining is a breathable, durable 40-denier nylon fabric with a soft touch
  • Full-length side zipper and foot zipper allow bag to be converted from sleeping bag to a duvet/down comforter; this also allows 2 Sea to Summit bags to be zipped together
  • 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
  • Semirectangular shape provides more room than a mummy bag for a more comfortable sleeping bag while maintaining thermal efficiency
  • 2-dimensional hood features drawcord adjustment to cinch and tighten around head; hood is designed to open flat when sleeping bag is used as a duvet/down comforter
  • Differentially cut inner layer is smaller than the outer layer to create a consistent thickness of insulation that precludes cold spots
  • Large zippered interior security pocket is great for stowing a few essentials, alleviating middle-of-the-night fumbling and preserving battery performance in cold weather
  • Baffle construction allows the down to remain fully lofted and keeps it from shifting
  • Sea to Summit Trek Tk II women's sleeping bag comes with a Ultra-Sil® compression sack


Many sleeping bags are rated for temperature by an independent testing protocol, the European Norm (EN) 13537. Each bag gets two ratings: a Comfort rating and Lower Limit rating. The Comfort rating is the lowest temperature at which the bag will keep the average woman (or "cold sleeper") comfortable, and the Lower Limit rating is the lowest temperature at which the bag will keep an average man (or "warm sleeper") comfortable. Everyone's body and sleep comfort is different, so EN Ratings are merely a guideline to help you compare products.

View all Sea to Summit Women's Sleeping Bags

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Best Use Backpacking
EN Lower Limit 19 degrees Fahrenheit
EN Comfort 28 degrees Fahrenheit
Temperature Rating (F) 28
Temperature Rating (C) -2
Long Right
2 lbs. 6 oz.
Regular Right
2 lbs. 3 oz.
Shell 33-denier nylon
Zipper Location Right
Insulation Type Down
Water-Resistant Down Yes
Fill 650-fill duck down
Fill Weight 19.4 ounces
Lining 40-denier nylon
Sleeping Bag Shape Semirectangular
Fits Up To (in.)
Long Right
Regular Right
Shoulder Girth (in.)
Long Right
Regular Right
Hip Girth (in.)
Long Right
Regular Right
Stuff Sack Size 7 x 16 inches
Stuff Sack Volume 10 liters
Compressed Volume 5.1 liters
Gender Women's
Rated 5 out of 5 by from perfect semi mummy fit I waited until after 3 camping trips to review. First off, all the specs are spot on with my use of the sleeping bag. Not once did the zipper snag. The inside stash pocket has a slim hidden zipper, so you don't feel a zipper against your body. Heat stays inside the bag very well if you close the draw string to insulate your head, it can keep you cozily warm on cold nights. The semi mummy shape allows me to move around, yet not get cold. I slept 2 nights in a hammock out in the Shasta Forest, and slept so well! On another camp trip I slept at a site in the the central coast, early spring. The bag stayed dry in the humid coastal night. Foggy morning. What's nice about this bag is the separate foot zipper. On warmer nights, just unzip to get air flow! This is a 4 season sleeping bag if you're not camping in temps below 20°! I love this sleeping bag!
Date published: 2017-06-21
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