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  • Mammut - Sphere UL 3-Season Sleeping Bag: 14 Degree Down - Dark Indigo
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  • Mammut - Sphere UL 3-Season Sleeping Bag: 14 Degree Down - Dark Indigo

Mammut Sphere UL 3-Season Sleeping Bag: 14 Degree Down

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    • Dark Indigo

    3 Reviews


    Supreme comfort without the weight.

    After a 15 mile day with elevation gains and losses that have left your head spinning, take comfort in the fact that the Mammut Sphere UL 3-Season 14 Degree Down Sleeping Bag will be there once you're ready to set up camp. Through a combination of lightweight fabrics and a high quality down fill, this sleeping bag will deliver the comfort you crave when you hit the sack for the night at a weight that won't bog your backpack down.

    The wind and water-resistant Prolight TX fabric is treated with a DWR coating to protect the down insulation from losing its loft if your bag should come in contact with moisture. Mammut's innovative baffles assume a wave shape, which prevent the bag from slipping but also eliminate cold spots in the bag. Mammut's performance hood allows for a full-range of vision when the hood is cinched down but is also effective at insulating against the cold. A neck collar eliminates draft, while the ergonomic footbox gives your feet room to wiggle while you sleep.

    • Backcountry Exclusive
    • ProlightTX shell with DWR (polyamide)
    • Light TX lining (polyamide)
    • 800-fill down insulation
    • Mummy shape
    • Water-resistant outer fabric
    • Performance hood
    • Ergonomic footbox
    • Item #MAM00EA

    Tech Specs

    [main] prolightTX (100% polyamide), [lining] lightTX (100% polyamide)
    800-Fill down (95% down, 5% feathers)
    DWR treatment
    Stuff Size
    7.5 x 8.5 in
    Recommended Use
    hiking & camping, backpacking
    Manufacturer Warranty

    Tech Specs

    • Reviews
    • Q & A

    What do you think about this product?

    Have questions about this product?

    Sleep well...

    • Familiarity: I've used it once or twice and have initial impressions

    That's what the inside of the bag says and you will. It's a very comfortable bag. At my size, i've got plenty of room to move around the bag. The zipper unzips past my knees so on warm nights, I leave it unzipped and use it kind of like a quilt. The material is smooth and soft to the touch. Packs down nice and small. Only negative (so far) is that i wasn't a fan of the compression sack that it came with so I gave it to the hubby for his quilt and am using a sea to summit compression sack, which puts the weight of the bag and stuff sack under 32oz.
    I'll update this review when I use it in colder temps.

    Not as light as claimed, still light

    • Familiarity: I've put it through the wringer

    It weighed 2 lbs. on my home scale (which is pretty accurate). Still very light for a 14 degree bag. It compresses very small with included stuff sack. My 600 fill bag takes up the whole bottom compartment in my bag. This bag leaves room for my neo air pad, and all my clothes in the bottom compartment. Great space savings. It's warm, and I think too warm for my needs. The biggest problem I had with it is the zipper only runs 2/3rds of the way down. It saves weight, but makes it impossible to vent my feet. The other problem I had was the feel of the nylon is very "plasticy" feeling. Hard to get around that feel with nylon but argon is much better on the skin.

    I used this for going UL on a Sierra XC trip. It was abnormally humid and there was lots of condensation on my tent that dripped directly all over the bottom of the bag. The DWR worked really well and the bag stayed dry after multiple days of this. I did like how smooth the zipper was compared to my marmot bag which tends to lock me in the bag.

    If you do need an UL 14° bag and can sleep comfortably in a mummy then this is a perfect match. If there were a 25-30 degree version I'd prefer that temp. rating. I found that a down quilt is much more suitable for me.

    light is right

      Love this bag, I was looking for a high quality down fill bag that was light and packed small. This serves the purpose and it really well made and so light. Comes with a compression stuff sack so this packs incredibly small. Super warm and efficient. High quality materials. Definitely not a big bag but enough for me and comfortable as I sleep on my back with my legs straight.

      I am 6'1'' and a rather muscular build. Would I fit in this bag?

      Hey Jonas,

      The short answer is you will fit in the 6 ft. version of this bag, but it will be a little tight considering it is a mummy design. Check out the Marmot Helium (Item # MAR003L) or the Marmot Sawtooth (Item # MAR003X) which comes in a 6'6" option and in the case of the Sawtooth a Wide version. I am 6'1.5" tall and use a long sleeping bag. Feel free to contact me directly with any additional questions.

      Kyle L. - Expert Gearhead

      size category?

      Hi, is the size category correct?According to mammut site, it should be 180cm/195cm, not 5ft6in/6ft. Confusing!

      How much does this bag weigh?