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Thanks to high-loft 800+ fill down and an lightweight 20D DWR-coated nylon shell, the Marmot Arete 40-Degree Down Sleeping Bag weighs well under two pounds without sacrificing functionality or warmth. An ideal summer bag for mild-weather trekking, bike touring, summer sojourns, the Arete is made for those who are looking to keep their packs light but don't want to spend a fortune, either.

  • EN comfort-rated at 50-degrees F for mild summer conditions; lower-limit-rated at 42-degrees F for occasional use during late spring or early fall
  • High-quality 800-fill goose down packs down well, rebounds nicely after repeated compression, and features a high warmth-to-weight ratio
  • Lightweight nylon shell protects the down insulation, breathes well, and compresses nicely for easy packing
  • DWR finish on the fabric repels frost, dew, and condensation
  • Down-filled full-length draft tube protects against areas where cold can creep in unexpectedly
  • Nautilus 6-baffle hood wraps around your head and provides 3D protection against heat loss
  • Hood Muff is a warm down gasket around the face designed to keep heat in while keeping the drawcord away from your face
  • Sewn baffles save weight ensure that the insulation stays in place so you don't suffer cold spots
  • Stretch tricot baffles at foot and head regions extend the life and shape of bag and improve warmth retention
  • Large trapezoidal foot box decreases constriction at the bottom of the bag and conforms to your foot's natural shape
  • Ground-level seams help prevent heat from escaping upwards through seams
  • Nylon stuff sack and a storage bag included
  • Reviews
  • Q & A

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Not super warm

  • Familiarity: I've used it several times

I've had this bag for about 2 years. It packs down pretty small and is great for warm weather. But I'd noticed that even when the temp got down into the 40s-lower 50s it doesn't really keep you warm. This last weekend I went out and it was in the 30s with a little mist. I knew this bag wouldn't keep me warm so I used a sea to summit reactor bag liner (advertised to improve the bag rating by 20 degrees). I froze. I still love this bag for non-cool weather. But its not great when it gets cool at all. Side note: Im not cold natured.

Way too cold

    I tried to use this bag for a year or so and ended up returning it.



    Even camping in the coastal redwoods in late summer, with nights in the mid 50s, I was freezing wearing every piece of clothing I had, plus my girlfriend's clothes, plus my lower torso inside my backpack. And that's with a Big Agnes insulated 2.5" thick air mattress.



    The EN comfort rating of 50F makes way more sense than the original claimed 40F rating.

    Love it

      I ordered five warm weather bags from Backcountry. I found this bag to be the best value and sent the rest back. the foot box is the largest and the zipper slides the best. the bag seemed to have the most room for wider shoulders and rounder mid-section like mine. If you are really skinny than try it but others might provide a tighter fit. Weight is incredibly nothing. One can compress the stuff sack by roughly 20% if needed.

      Other bags ordered but sent back:
      • Western Mountaineering Highlite 35 degrees down
      • Marmot Plasma 40 degrees down
      • Marmot Atom 40 degrees down
      • Super Spiral Hugger #5 40 degree

      Fire Breathing Dragon of Awesomeness!!!!

        Just returned from a three day loop in CO with this red devil of warmth. The first morning after camping at 11k feet I woke shockingly to find frozen water. At least an inch thick of solid ice at the top of my cooking pan! I slept like a baby the entire night using my Arete as an open quilt. Granted I was wearing a light down jacket, and medium socks. Everyone else in the group froze that night using significantly warmer bags (30 & 25). You can't go wrong with this bag, especially weighing in at under 2 lbs, are you kidding ME!!

        Fire Breathing Dragon of Awesomeness!!!!

        Excellent lightweight summer bag!

          I used this bag for the first time on Memorial Day weekend on a remote Maine lake inside a Marmot Limelight 2 tent with an insulated Big Agnes sleeping pad. I was toasty warm with just underwear and had to keep the bag open near the shoulders until the early morning hours when the temps dropped into the 40's with a stiff breeze and drizzle. The bag really compresses well and lofts nicely once out of the stuff sack. I'm very satisfied with the warmth, compressibility, and weight. This is a great summer bag and I'm very happy with the quality and workmanship. This is my first down bag and I'll never go bag to a synthetic. I would recommend this bag to anyone looking for a warm and light summer bag. I'm really glad that I purchased a Marmot bag. Excellent summer bag!

          perfect summer sleeper

            With 800 fill goose down, this seems to be the perfect summer bag. I also ordered the Sea to Summit EVent compression Dry sack (small) and it fits perfectly. It compresses to approximately the size of a Nalgene bottle (slightly larger diameter). I am now able to stuff this bag and a full size thermarest mat in the sleeping bag compartment of my Deuter Aircontact 65+10 backpack. This bag doesn't dissapoint!

            Super summer sleeping bag

              This is currently my favorite summer sleeping bag on the market right now. I like the way Marmot cuts their bags (wider in the shoulders than Mountain Hardwear), the way the hood fits, and the roomy footbox. The bag itself is super light with 800+ fill down and compresses quite well (an puffs back up quite nice). The only thing you need is a waterproof stuff sack!

              Teeny and warmer than advertised

                I am a really cold sleeper, I got this for sultry summer nights only. I always seem to underestimate desert nighttime temperature drops and I've actually used it down to about 25 degrees (which was pretty uncomfortable). But I was fine in the 30-40 degree range. The best part is its negligible weight and amazing packability.

                Hey guys, What's the size of the...

                Hey guys,

                What's the size of the bag after its been thrown in it's stuff sack?

                How does this compare to the Atom ? Is the...

                How does this compare to the Atom ? Is the weight/fill the only difference... Which is better?

                Best Answer

                Good Questions. You are correct, the main difference is the Atom is using a higher fill power (850 vs 800) making it slightly lighter and a bit more durable. With these warmer weather bags there is less of an difference in weights between 800 and 850 since they use less fill. Overall, they are both great bags and it's hard to go wrong with either one.

                how small dose this bag pack? and would...

                how small dose this bag pack? and would you recomend for lightweght backpacking

                does this bag have a zip along the foot...

                does this bag have a zip along the foot of the bag for warmer weather? I am a warm sleeper and need the option of this, but want a bag that is still going to be warm enough with everything zipped up in slightly cooler weather....If not - is there another bag that offers this?thanks,Dave