Arc Element Configuration Page

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The best all round quilts with an excellent balance of weight and bulk against durability and lasting performance.

From 5° to 30°, with custom sizing and materials.

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Custom item. Multi week lead time.


From this page all temperature ratings, sizing options and accessories of the Arc Element are configured. 

The Arc Element fits its place well as the most versatile Nunatak quilt line. A little more rugged than the extreme Arc UL, not as specialized as the Arc Pro. Very agreeable packed bulk and, for a 20°F - 73" long, right around 22 ounces.

Shell and Liner Fabric

The shell and liner fabrics of the Arc Element series is in the venerable 1.0 ounce per yard range. Still very light, this quality Pertex weight has a considerable advantage over the UL materials in long term durability and immediate tear strength.

Our silky smooth 1.0 nylon taffeta is specifically made as a sleeping bag liner. It has high breathability and feels comfortable against bare skin with its semi-matte sheen. 

Temperature Options

The Arc Element is available from a 30°F summer style quilt all the way down to 5°F, in steps geared to fit the most useful seasonal applications. By far the most popular all-round rating is the do-it-all 20°.


A six step measure of the inside useful length in 5" increments is replacing the subjective and sometimes confusing Small to X-Long moniker. Using this system you can choose how far up the quilt reaches when lying on your back. Reaching just the chin level is the absolute shortest anyone should go, and then only on quilts for the warmer seasons. Forehead is the best compromise of low weight - efficient coverage.  As always, it is prudent to size up if in doubt. If just a little too short one tends to compress the foot area insulation the the detriment of cold feet.

Furthermore the shoulder and foot area widths can be customized for individual needs and sizing. Typically a 2 season quilt can be built a little narrower than a winter oriented set-up. If you're new to using quilts for the backcountry, experiment at home with a blanket before committing to a sizing setup. 

Foot End Design

The Arc Element quilts are offered in two foot box configurations, also in the menu below. The traditional Arc finish is a permanently closed 24"-28" long section with a round bottom piece sewn in place. In other words, a design familiar from high-end mummy bags.

The Vector foot end is a modular concept that allow the user to switch from closed to blanket style open foot area in a few simple steps. This option, while very adaptable to changing conditions, lack a little in thermal efficiency compared to the regular Arc. It also adds a small amount of weight, for those who count every gram. A page with a few pics detailing the foot box options is here.

Go to the bottom of this page for the full Arc Element Configuration Menu!

Approximate inside length w, closed footbox63" - 68" - 73" - 78" - 83"
Shoulder width options48" - 54" - 60" - 66"
Foot Area Circumference36" - 38" - 42" - 45"
Differentially cut liner/shellYes, except 30°
Temperature Ratings Available30° - 20° - 15° - 5°
Length and width choices affect fill weight by roughly ½ to 1 ½ oz, depending on temperature rating.
Fill Volume, 30°F, 73"L x 54"W x 38" Foot11.3 oz
Fill Volume, 20°F, 73"L x 54"W x 38" Foot14.1oz
Fill Volume, 15°F, 73"L x 54"W x 42" Foot16.8 oz
Fill Volume, 5°F, 73"L x 54"W x 42" Foot22.5 oz
30°F, 73" L - 54" W - Total Weight, 1.0 Shell/Liner20.1 oz
20°F, 73" L - 54" W - Total Weight, 1.0 Shell/Liner23.1 oz
15°F, 73" L - 54" W - Total Weight, 1.0 Shell/Liner26.4 oz
5°F, 73" L - 54" W - Total Weight, 1.0 Shell/Liner33.5 oz

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Arc Element

I ordered a Vector Arc 15 degree bag/quilt. Jan helped me modify the Vector so it opens completely as a quilt and the foot box closes completely with a cord acting as an arc. I added the weather resistant Epic shell with 900 plus fill down and added down insulation. Jan recommended a few inches be added to the Arc. I've used this bag indoors and outdoors every night for the last 6 months. It is perfect as a quilt inside and is wonderful inside a Gortex bivy outside. If you wear a down hooded jacket inside this Vector you will be comfortable in winter conditions. I love it and keep it with me wherever I travel in Oregon. It could be a life saver for me and my wife if we ever ran into a situation where we were stuck in winter conditions. Jan is always helpful whenever I have any questions. Customer service is awesome.


    Arc 15F

    From an email we received:

    Dig the top quilt u made me.
    Super warm-just perfect.


      New 2 Season Arc Quilt

      From an email we received:

      I purchased my quilt summer 2016 and have used for ~ 20 nights since. It is considerably warmer than the three season (UK) bag it replaced while also being ~ 30% lighter - a testament to the excellent design and materials. The flexibility and comfort of the quilt it not undersold and I intend to take it trekking in Greece this spring where I will be sleeping at elevations between sea level and 2500 metres. No signs of wear and tear so far. Good service and delivered well ahead of original estimate. No reservations about ordering from Nunatek again.

      Kind regards,

      Jon Ball


        Arc Alp 15°

        Review from 04/27/2016:

        I have now used my quilt for 7 nights in South West Tasmania. It was excellent. Conditions were not that cold (4 deg C) but it was super warm and comfortable. Lumpy down from shipping dissipated. I even felt sorry for my friend who had a regular bag. So - I am very happy with my purchase.


          New quilt day!

          This review from 04/27/2016 is an excerpt from an email we received, and published here with the author's permission. Nunatak Admin.

          I received the quilt yesterday. First things first - I LOVE THE QUILT. There are very few possessions I own that I would never part with under any conditions - this quilt is already 1 of them. 1. The craftsmanship is superb - better than the Specialist I have. As good as western mountaineering or Katabatic. 2. You are properly filling your shells - I feel the shells were underfilled during Tom's ownership. No need for overfill whatsoever. 3. the 2" differential cut is perfect ( I wondered if 4" would be better). This is the most comfortable quilt/bag I've ever experienced. 4. I love the color (I was not expecting to like it) - your photos online are very accurate representation. 5. You delivered in 4 weeks! 6. The drawstring in the middle of the neck baffle is SUPERB - supreme comfort. 7. Footbox is generously filled and baffled. 8. You delivered right on the weight I was expecting - exactly 1lb 10oz (I had to extrapolate from your published numbers) 9. You sent along stickers and a "Birth Certificate" for the quilt. 10. I love the 20 degree so much I may sell my specialist instead of modifying it and purchase a vector from you for summer nights. Ian

          • 1 out of 1 people found this review useful.

          32° Arc Alp w Vector foot

          Dearest Jan, My sleeping quilt has arrived earlier than expected. Oz customs must be improving. It looks perfect for what I need so will put it to the test over the next few weeks. It has shaved 520gms off my pack weight, a big bonus already. Thank you so much for your attention to this order, I really do appreciate it. Bestest wishes Lorraine

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            Arc Element Configuration Page

            Arc Element Configuration Page

            The best all round quilts with an excellent balance of weight and bulk against durability and lasting performance.

            From 5° to 30°, with custom sizing and materials.

            Product Options
            Temperature Rating
            The all time most popular choice is the versatile 20°F.
            30° is considered a 2 season rating, while 5° qualifies for light 4 season use.
            Inside Length
            The useable length measured from inside the footbox to the top hem, without compromising the insulation loft. For example, if you're 6' tall and want the quilt to reach over your head, choose 73".
            Shoulder Width
            54" is a good standard for regular sized folks who doesn't toss around too much. For winter bags go one size up.
            Foot End Style
            The Arc is the well known enclosed footbox sewn with a rounded bottom piece.
            The Vector gives you the option of opening up the quilt's foot area to a blanket style appearance. This comes with a slight compromise in thermal efficiency and a marginal weight increase.
            ARC. Permanently Enclosed Foot Box
            VECTOR. Convertible - Blanket to Enclosed
            Footbox Size, Arc & Vector Models
            38" is the male size 10 shoe standard. Adjust accordingly.
            Shell Fabric

            Please go to the Fabric Page for help choosing the shell material.

            Liner Fabric
            Down Type

            Choosing Hyper-Dry moisture resistant down will help combat the effects of perspiration, misting tents and damp air. Nunatak products made with Hyper-Dry down will have a slight increase in bulk over those made with regular down. In some instances they may contain an additional 5% of fill weight.

            900 Fill Power Goose Down, RDS Certified
            900 Fill Power Hyper-Dry, RDS Certified
            Down Overfill
            Cold sleeper? Consider adding a few ounces of extra fluff.
            Strap package

            Straps snugs the quilt around you and/or the sleeping pad. Options are: None (really?), ultralight shock cord style controllers, or the fully featured standard ¾" strap package.

            2 Side Mounted Underbody/Pad Straps - Removable.
            Gamut Climashield Over-quilt Compatability

            This mod makes a future over-quilt application as effective as possible. It adds snap buttons in the places needed, plus stores a record of your product's finished measurements and attachment points.

            No Thanks!
            Yes, prepare my quilt for future Gamut over-quilt application!
            Weather Resistant Foot Area Upgrade
            This substitutes the shell fabric on the lower third of the quilt with hard wearing weatherproof Epic material. Epic will also be applied across the top and down 3". Those are the two areas of most wear and exposure, thus greatly prolonging the life of the quilt.
            The upgrade adds about 1 ½ oz depending on size.
            No Thanks!
            Yes, Weather resistant fabric on lower third of quilt and across the top.