Sea to Summit Women's Ascent -9 Down Sleeping Bag

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The Women's Ascent -9 Down Sleeping Bag is a female-specific, versatile bag designed for comfort and adaptability and suited to a wide range of adventures in cold conditions. It features ULTRA-DRY 750+ loft goose down, 20D recycled polyester shell and lining, a non-PFC durable water repellent finish and a triple-zip Free Flow Zip System that allows for multiple configurations and ventilation, including opening the bag right out. Comes with a compression sack and a storage cell.


  • Women's Relaxed Mummy Fit: A more relaxed yet tapered mummy fit with high thermal performance. Wider at the hips and narrower at the shoulders for a better fit and heat retention for women.
  • Lightweight 100% recycled 20D nylon shell with a non-PFC DWR finish to protect against wind and moisture and a 20D recycled nylon liner for greater comfort
  • bluesign®-approved fabrics
  • 750+ Fill Power, RDS-certified, Goose Down with ULTRA-DRY Down treatment for improved water resistance in damp conditions
  • Free Flow Zip System for reliable, snag-free operation and minimal weight:
    • Primary zip: full-length #5 with zip-plow and two sliders
    • Secondary zip: 1/2-length #3 with zip-plow and two sliders
    • Footbox zip: #5 with two sliders
  • Vertical chest baffles, horizontal baffles in the lower half and base, box wall baffle construction throughout
  • Generous fitted hood with two soft touch adjustments and fits a Sea to Summit regular pillow
  • Fitted front draft collar: scalloped over the neck and oversized at the shoulders
  • Single, down-filled draft tube along the top of zips
  • Internal pocket for phone / GPS / valuables
  • Pairs with unisex Sea to Summit bags for a snug double sleeping bag
  • QuiltLock System allows integration with Sea to Summit quilts
  • Comes with an Ultra-Sil compression bag and a storage cell


Fits to 170cm (Regular), 185cm (Long)
Shoulder Width 71cm (Regular), 76cm (Long)
Foot Width 46cm (Regular), 51cm (Long)
Compression 20 Litres (Regular), 26 Litres (Long)
Fill ULTRA-DRY Goose Down 750+ Loft, RDS certified
Fill Weight 797g (Regular), 900g (Long)
Average Weight 1251g (Regular), 1403g (Long)
Outer Material 20D recycled polyester
Inner Material 20D recycled polyester with a non-PFC DWR finish
Temperature Rating minus 9°C comfort rating woman / minus 15°C Lower comfort rating for men; Temperature rated in accordance with ISO 23537-1:2022

ULTRA-DRY Down™: With the introduction of water-repellent ULTRA-DRY Down™ Seat to Summit have virtually eliminated the negative effects moisture has on down. The ULTRA-DRY Down™ water-repellent treatment protects the down from external moisture and condensation from inside the bag. It is a permanent (no loss of treatment effect has been seen in over 14 wash cycles) Nano-level water repellent polymer treatment applied to Sea to Summit high loft, high quality down. The Nano-thin treatment vastly improves the down's reaction to water without effecting its weight or loft performance. ULTRA-DRY Down™ retains over 60% more loft and absorbs 30% less moisture when compared with untreated down. Sea to Summit sleeping bags dry out 60% faster than bags with untreated down. The Nano-level treatment also inhibits bacterial and microbial growth, which makes Sea to Summit sleeping bags more hygienic and improves their lifespan.

Responsible Down Standard (RDS): The RDS is helping to shift the entire down and feather industry towards more humane animal rearing and handling practices. Overseen by the industry leading Textile Exchange, the RDS requires independent, third party assessments of all aspects of animal rearing and handling throughout the entire supply chain. By only using down that meets the audited requirements of the RDS we can have confidence that each phase of the collection process has been completed with the welfare and ethical treatment of waterfowl in mind. To find out more about how the RDS is improving animal welfare during down collection, please visit (link will open a new window).



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