Sea to Summit Flame Ultralight 35F Sleeping Bag - Women's

$409.00to $429.00
Color: Gray
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Ready to move fast and light through the warm months? This women's Sea to Summit Flame Ultralight 35F sleeping bag keeps you cozy while serving up a light weight and small packed volume.


  • Ideal for summer through early fall use
  • 850-fill-power down keeps you cozy
  • 10-denier shell and 7-denier liner materials help deliver a light weight and compact packed size
  • 1/3-length zipper


Many sleeping bags are rated for temperature by an independent testing protocol. REI and the broader industry now use the International Organization for Standardization (ISO) 23537 protocol, which improves on the older European Norm (EN) 13537 standard; you may still see older items in our assortment that were only EN tested. With either protocol, each bag gets a Comfort (or T-Comfort) rating and Lower Limit (or T-Limit) rating. 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. Ratings are based on a person wearing one long underwear layer and a pair of socks, sleeping on an insulated surface with a minimum R-value of 5.38. Many brands use the Comfort rating for women's bags and the Lower Limit rating for men's and unisex bags. Everyone's body and sleep comfort differ, and conditions of use (posture, clothing, sleeping pad R-value, wind, humidity, etc.) affect total insulation, so EN and ISO ratings are intended as a guideline to help you compare products, rather than a guarantee of warmth.
View all Sea to Summit Backpacking Sleeping Bags

Technical Specs

Best Use


Tested Comfort

35 degrees (F) - EN

Temperature Rating (F)

35 degrees (F)

Temperature Rating (C)

2 degrees (C)


Regular: 1 lb. 1.8 oz.

Long: 1 lb. 4.3 oz.




10-denier nylon

Zipper Location


Insulation Type


Water-Resistant Down



Ultra-dry down

Fill Weight

Regular: 11.2 ounces

Long: 12.8 ounces


7-denier nylon

Sleeping Bag Shape


Fits Up To (in.)

Regular: 66 inches

Long: 72 inches

Shoulder Girth (in.)

Regular: 57 inches

Long: 60 inches

Hip Girth (in.)

Regular: 54 inches

Long: 56 inches

Stuff Sack Size

5 x 10 inches

Stuff Sack Volume

3.3 liters

Compressed Volume

Regular: 2.9 liters

Long: 3.8 liters



51 reviews with an average rating of 4.5 out of 5 stars

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