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Sea to Summit

Sea to Summit Flame III Women's - Regular

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The Sea to Summit Flame III Women's is an ultra-light and technical down sleeping bag, designed to keep you warm whilst minimising packed weight and size.

Designed specifically for women, the Sea to Summit Flame III Women's sleeping bag is a high performance yet lightweight bag that has an excellent fit whilst providing extra warmth. With a comfort temperature limit of -10*C, the Flame III utilises a sewn through construction (which minimises weight) and vertical baffles on the chest to maintain down positioning for heat reflection. The updated sizing 
provides extra room for shoulders and hips without compromising thermal efficiency and a 1/2 zip aids access and ventilation. This bag is ideal for cold-weather fast and light hikes.

The Flame Series spans everything from an ultralight liner to an expedition weight mid-winter bag. While the end usage is very different, they reflect a design ethos of matching weather conditions to the lightest bag possible. The secret to the impressive performance is a combination of premium materials and careful design. The RDS 850+ Loft premium goose down, light-gauge #3 YKK zip and high performance 10D Nylon shell and 7D lining fabrics set the stage for superior performance. These materials are combined with a contoured mummy design for efficient insulation, and that mummy design is then tweaked for each model to best fit the use scenario.

The women’s specific fit is wider at the hip and narrower at the shoulder and we’ve added extra down overall for increased warmth.

The ULTRA-DRY Down™ water-repellent treatment protects the down from external moisture and condensation from the inside of the bag, virtually eliminating the negative effects moisture has on down. All Sea to Summit Down Sleeping Bags use Responsible Down Standard (RDS) certified down. The ULTRA-DRY Down™ protection also makes the Flame™ an impressive hard-alpine or adventure racing bag, where every gram is counted and down has never been a viable option.

More Help? For further assistance on choosing your down sleeping bag, we have an article explaining fill power, the pros and cons of down over synthetic insulation and more info on caring for your bag available to view here: A Guide to Down Sleeping Bags.


Check out Rock + Run's detailed review of the Sea to Summit Flame III Women's Sleeping System here


  • Ultra-light and technical, our Flame™ Series bags are designed to keep you as warm as possible while minimising packed weight and size.
  • Sewn through construction minimises weight
  • Sewn through vertical baffles on chest optimises positions of down to prevent it moving during use and cold spots as a result
  • ½ zip with single slider aids access while keeping weight to a minimum
  • Updated sizing provides extra room for both shoulders and hips while still maintaining insulation efficiency
  • Women’s specific contoured mummy shape for efficient insulation
  • Ultralight 7D and 10D fabrics for minimal weight and packed size
  • RDS 850+ Loft Premium Goose ULTRA-DRY Down™ for maximum insulation value
        Note: This bag is not designed to pair with another


          • Maximum body size: 170 cm
          • Inner bag length: 181 cm
          • Comfort Temperature: -4 °C
          • Comfort Temperature limit: -10 °C
          • Extreme temperature limit: -29 °C
          • Maximum inner width: 73 cm 
          • Footbox width: 44 cm
          • Insulated collar: No
          • Main Fabric: 10D Nylon & 7D Liner
          • Filling: 440g of ULTRA-DRY Treated down 
          • Fill power 850+ cuin
          Weight: 665g
            Customer Reviews
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            Filter Reviews:
              Laura H.
              United Kingdom United Kingdom

              Not as warm as I was hoping.

              I used the bag for the first time at the weekend up at kinder scout, the temp went below 0 and I was still cold. I sleep really cold anywwy so I was hoping for a warm bag. I only wore merino leggings on my bottom half which was the coldest part of my body if I wore warmer PJ's or put a silk liner in my bag it might have been ok. The bag is super lightweight which is great but the compression bag it comes with is a bit of a nightmare to get the bag back into so I use a diff compression bag. I'll give it another go with warmer PJ's and a silk liner.


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