How to Choose Sleeping Bags for Backpacking
Sea to Summit Flame Ultralight Sleeping Bag Liner - Women's
This product is not available.
Going on a fast-and-light summer trek or want to boost your cool-weather bag to winter temperatures? This women's Sea to Summit Flame Ultralight sleeping bag liner will do the trick.
Shop similar productsKey Details
Fill
Ultra-dry down
Temperature Rating (F)
55 degrees (F)
- 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
Imported.
Temperature ratings are intended as a guideline to help you compare products, rather than a guarantee of warmth, since many different factors contribute to your comfort while you sleep. Backpacking bags are typically rated for temperature according to an independent testing protocol—currently International Organization for Standardization (ISO) 23537, though some older items followed European Norm (EN) 13537. Testing is based on a person wearing one base layer and a pair of socks, sleeping on an insulated surface with a minimum R-value of 5.38.
Each bag then gets 2 ratings: 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. Some brands determine their own temperature rating by aligning to the Comfort rating for women’s bags, to the Lower Limit rating for men’s bags, or somewhere in the middle for nongendered bags.
View all Sea to Summit Backpacking Sleeping BagsEach bag then gets 2 ratings: 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. Some brands determine their own temperature rating by aligning to the Comfort rating for women’s bags, to the Lower Limit rating for men’s bags, or somewhere in the middle for nongendered bags.
| Best Use | Backpacking |
|---|---|
| Tested Comfort | 55 degrees (F) - EN |
| Temperature Rating (F) | 55 degrees (F) |
| Temperature Rating (C) | 13 degrees (C) |
| Ultralight | Yes |
| Shell | 7-denier nylon |
| Zipper Location | Right |
| Insulation Type | Down |
| Water-Resistant Down | Yes |
| Fill | Ultra-dry down |
| Lining | 7-denier nylon |
| Sleeping Bag Shape | Mummy |
| Gender | Women's |
Buying Advice
Review this Product
Adding a review will require a valid email for verification
Customer Images
Karin W.
Insanely comfortable
3 years ago
Absolutely loved this sleeping bag. Easy to fit anywhere. Great for kayak camping, backpacking or any outdoor sleepover. Extremely comfortable. Everything you could ask for. Our weather was to the warmer side, but I didn’t get hot. The bag kept me cool all night. Next up, cooler weather. Cheers to life outside in comfort.
Originally posted on Sea to Summit
Lan H.
Great product
2 years ago
[This review was collected as part of a promotion.] Greatly convenient packed. Size-wise are perfectly fit me. The only thing I have issue is it’s quite slippery and keep sliding from my TAR sleeping bad. I’m just a beginner so I’m still trying to explore. I would recommend this product definitely.
Originally posted on Sea to Summit
Katie O.
Love it!
2 years ago
[This review was collected as part of a promotion.] This sleeping bag is amazing! I absolutely love the womens specific design, which is also great for side sleepers. This is the best sleep I’ve had in the backcountry in 10 years, and paired with the womens specific sleeping pads (I use the Ether Light XT) I find that I am way more comfortable in the hips and legs than with unisex or mens sleeping setups. If I’d change anything it would be to add a bigger baffle around the face opening, since sometimes cold air slips. I got the 15 degree and it packs down small and is very light for such a warm bag! Haven’t had a very cold night in it yet but I think it’ll perform nicely when the weather starts to bite more
Originally posted on Sea to Summit
Kathrin
Miserable sleeping bag
1 year ago
I bought the Flame 3 sleeping bag, comfort temperature -4°C for backpacking in the summer: I spent a month in the Swiss and Slovenian Alps (June/July) and a month in Iceland (August). Every single night that was below 10°C I froze in this sleeping bag. I had to use the silk sleeping bag, wear Merino underwear and usually also the down jacket so that I could sleep. This was truly the worst purchase of my life. I have a Marmot sleeping bag with a comfort temperature of -4°C in which I have never felt cold, even at sub-zero temperatures. These sleeping bags are two different worlds. I would not recommend this Flame 3 sleeping bag!
Originally posted on Sea to Summit
Jan T.
Great Flame IV sleeping bag
4 years ago
After hiking the JMT twice and lots of other backpack trips with my old down bag over the past 10 years, I relented and upgraded to the Flame IV. Now I am not the gear head who spends hours comparing weights and volumes, but this bag is worth the money. I am impressed both by the weight and the tiny stuff sack it fits into. It has really presented, for me, a giant leap in sleeping bags. I took it on a solo shakedown trip to the Zirkels in September where it got into the 30's- and I was plenty cozy. And yes, I am hardly ever too warm sleeping. I would highly recommend this bag for its weight, superior loft, and ability to be compressed to next to nothing. No more sleeping bag taking up half the pack.
Originally posted on Sea to Summit
Sheila P.
Best Sleeping Bag Ever
2 years ago
[This review was collected as part of a promotion.] I love love love this sleeping bag. It's beyond comfortable. I'm had some of my most comfortable nights of sleep (not just camping, but in general) in this bag. I have the 25 degree version and it definitely hasn't disappointed when it comes to keeping me warm in cold temperatures. The ultralight spec is also very appreciated -- this bag comes in handy when backpacking because it's super light -- a lot lighter than the ultra quilts that many recommend. Personally, I move a lot in my sleep so I prefer the mummy option to the quilt. 5/5 stars, highly recommend.
Originally posted on Sea to Summit
Melanie D.
Light and Puffy
4 years ago
I've used it a few times in cold Colorado summer weather and it certainly keeps me warm enough for a 25 degree bag. It's light! It's puffy...BUT you need to shake it out a lot and let it sit for a long time in order for the feathers to fill out. Because of the white cover, you can even see the "cold" spot where there are no feathers until you puff up the bag. The bag barely fits in the compression sack. Therefore, I use a different compression sack. Sea to Summit should change the size of the one they send you. Finally, the storage sack is way too small for a bag like this which should be stored in a larger sack. Overall, it is a really nice bag. There are a few features that need adjusting. You will stay warm and cozy though!
Originally posted on Sea to Summit
Courtneytx
sleeping soundly in a warm fluffy cloud
6 years ago
Flameâ„¢ Ultralight Women's Sleeping Bag, 25degree, regular So fluffy. so comfy. so light and packable!! This bag is perfect for my bikepacking adventures! it packs so small! I have the 25degree bag, hoping I never truly test the temperature rating, i sleep cold. I always use a silk bag liner to keep my bag cleaner and added warmth. I had been eyeing this bag for a long time... I am so happy i finally bought the sleeping bag of my dreams as my camping season took off. A good night sleep is so crucial for a full day of adventure and fun.
Originally posted on Sea to Summit
Courtneytx
sleeping soundly in a warm fluffy cloud
6 years ago
Flameâ„¢ Ultralight Women's Sleeping Bag, 25degree, regular So fluffy. so comfy. so light and packable!! This bag is perfect for my bikepacking adventures! it packs so small! I have the 25degree bag, hoping I never truly test the temperature rating, i sleep cold. I always use a silk bag liner to keep my bag cleaner and added warmth. I had been eyeing this bag for a long time... I am so happy i finally bought the sleeping bag of my dreams as my camping season took off. A good night sleep is so crucial for a full day of adventure and fun.
Originally posted on Sea to Summit
Fabienne F.
Overall good, but a compromise for winter
4 years ago
I use the flame liner together with the flame 15 as a cold weather system. It’s a compromise for me - I’m a very cold sleeper, often out in winter temperatures, and nobody actually makes a decent winter sleeping bag specifically for women. The flame 15 is one of the best bags I’ve tried so far for warmth to weight. However, I’m not big on the nylon on nylon (sleeping bag, flame liner, puffy jacket) in winter as it’s unbelievably noisy. I hope sea to summit will come out with a proper women’s winter bag that isn’t too heavy soon.
Originally posted on Sea to Summit
1 - 10 of 60 Reviews