Gamut Climashield APEX Quilt

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Synthetic filled quilt offered in 35° - 42° - 50° options. Use as an over-quilt on top of a down bag or as a mild weather stand alone quilt.

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The Gamut

We spent the summer developing and testing the Gamut, and found it to be a great stand alone product. But even more so, the Gamut is the perfect companion piece to a down based quilt or mummy. More about this in a bit.

3 temperature ratings based on pre-cut and stabilized Climashield APEX sheets: 35° - 42°- 50°. 

Two shell fabric catagories:

#1. Either Pertex Quantum 0.8 oz/yd or Membrane 0.66 oz/yd. These are fabrics with very effective vapor transfer and a soft, pleasant feel. Super light, breathable, fast drying. Orange, black, green, blue.

#2: Equally light is the techy waterproof/breathable Robic ripstop. At 0.74 oz/yd this weather resistant shell is an outstanding companion to the Apex insulation for really wet conditions, providing bivy-bag like performance with no weight penalty.

Liner material is always black Membrane.

Two foot end configurations:

ARC foot. Sculpted round style footbox; roomy, snug, thermally efficient and lightest weight. Simple, foolproof. 

Vector foot: Blanket style layout with a convertible footbox (flat/open or closed/snug), using a 24" zipper and drawcord end closure.

Other details

We wanted to solve a couple of issues. The convertible footbox needed to be able to close up in a well sealed manner. The basic idea of a stuff-sack style drawcord opening, while appealingly simple and foolproof, had to be improved. We re-cut the shape of the foot end of the quilt in order to bring the closure down and under the feet. This is a design change well needed in openable footbox synthetic quilts, creating a very tight and snug feel. 

The drawcord channels at the top and bottom behave differently due to the un-quilted construction with no baffle stitching. On our down quilts these channels are moved in from the ends to create insulated areas at the head and foot interface. This method will not work on synthetic covers. The solution is an internal channel of precise circumference, but changing in size with the different insulation values available.

Quilt or quilt hybrid?

Full length zipper is an option, closing the underside  up to seal out any drafts.  For best performance and comfort choose the 62" width. Available with both Arc and Vector foot ends. 

When to choose Synthetic Insulation

As a stand alone moisture resistant, down-shifting immune quilt the Gamut surprised us. It felt warm and cozy, and sound sleep was ensured knowing that damp tent walls, or heavy dew, did little to diminish the loft. Quite comforting, in fact. 

The secondary use of the Gamut is as a booster over-quilt on top of down mummies and quilts. This solution is equally effective and can save the substantial investment in a dedicated winter bag. With the continuous sheet style APEX insulation there's always a cover over bald spots from shifting down in the main bag. Again, dampness from external sources is typically only affecting the synthetic, while below the down remain protected. And condensing body moisture that are settling in the steep temperature gradient of the outer layers are also away from the down. This quality is especially valuable in winter conditions.

Compatibility and Sizing

Nunatak down quilts and the Gamut are designed to join effectively with correct sizing for efficient coverage, and also minimizing the strap and snap clutter.

There's an option in the configuration menu of new down quilts to install the needed hardware for future Gamut over-quilt application. Backwards compatibility is possible by sending your old Nunatak quilt to us for the necessary mods when purchasing a Gamut. 

The Gamut will also fit over just about any existing quilt or mummy. It is however important to size it right. Call or email if in doubt.

The Gamut size run is highly customizable. Length, width and foot area are offered in many sizes and an untold number of combinations to fit all frames and applications.

Refills and zipper replacement!

Climashield APEX, being a synthetic insulation, will likely not last as long as a quality down fill. After extended use, involving several laundry cycles,  it could become 'flat' with significant loss of loft. If this happens, the Gamut design enables us to easily replace the fill at the Nunatak shop.

The zipper converting the quilt from blanket to semi enclosed state is also adapted for non-intrusive simple replacement by anyone with a sewing machine in 30 minutes.  And should it start presenting issues in the middle of a trip, there's little lacing tabs along it, enabling full closure with any string or cord. This feature also allows for significant expansion of the girth for use as an over-quilt with really bulky winter bags. Unfortunately these features are not incorporated with the full zipper option.

Built for the long haul!

A full zipper 42° Gamut sized as a cold weather over-bag. The shell is the waterproof/breathable Robic, a very capable ultralight fabric for damp conditions. This one is close to 25 oz total, being a massive 67" wide, with an oversized foot and a 2 ounce #5 zipper.

Same as the first pic, here turned upside down to show a 30° Arc UL down quilt inside. We design 6 easy to use attachment points, allowing a hassle-free integration between any Nunatak down quilt and the Gamut. Sized for a correct relationship, such a layered concept is the modern version of a deep-winter sleep system, with far more all season utility compared with one massive sub-zero quilt/mummy. 

The 42° Gamut is here over-quilting an Arc Alp 30°. The combined temperature rating is in the teens.

Nunatak down quilts snap to the Gamut, while still allowing the use of standard under-body straps. 

The openable foot box is designed with a domed cut that moves the cinch center under the feet when tightened.

A 42° Gamut, measuring 80" long, 57" wide with a 46" footbox is shown here in the supplied stuff sack. Total weight 575g.

Temperature Rating35° - 42° - 50°
Inside length65" - 70" - 75" - 80" - 85"
Length, open blanket stylePlus 7" to above
Shoulder width options52" - 57" - 62" - 67"
Foot Area Width38" - 42" - 46" - 50" - 54"
Total Weight, 42°, Length 70", Width 52" x 38"17.2 ounces
Total Weight, 42°, Length 80", Width 52" x 38"18.5 ounces
Total Weight, 42°, Length 85", Width 57" x 54"24.2 ounces

Raise the bar

Got the 42° and am extremely pleased with it. 80x57x46 with Pertex shell weighs 21.1oz including the straps and stuff sack. The offset cinch cord is one of those no-brainer nice little details that you don't find anywhere else unless you ask for customization, and the tapered cut on the footbox that draws the cinch hole down under for no-draft performance is a simple but brilliant idea - and it works! Jan was happy to do a minor customization for me and the entire question/order/construction/shipping was outstanding. I knew Nunatak has always been known for high quality items and workmanship but I was honestly surprised when examining the quilt. It's just impeccable, impressively so. Even the stuff sack is two notches above the best. Thus far I can say that it's plenty warm at 50F but I haven't had the chance to see what it feels when it's a bit cooler...suspect it will be pretty true to rating. Perfect summer quilt, zero regrets.


    Great quilt!

    I ordered a 42°, 85" length, 57" width quilt back in November 2016 and couldn't be happier! I am able to pack it down very small in a compression sack and it weighs very little. I recently used this with a 40° bag on a backpacking trip where temps at night were about 30° and I was very comfortable. I look forward to warmer months when I can use just this quilt on my trips!! Great product, company answered all my questions when I called prior to the order, kept me informed as the item was being made, and I look forward to ordering more items in the very near future!!

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    Gamut Climashield APEX Quilt

    Gamut Climashield APEX Quilt

    Synthetic filled quilt offered in 35° - 42° - 50° options. Use as an over-quilt on top of a down bag or as a mild weather stand alone quilt.

    Product Options
    Temperature Rating
    These are conservative ratings for the Gamut used as a stand alone quilt.
    50°F / 10°C - 2.5 oz Climashield APEX
    42°F / 5°C - 3.6 oz Climashield APEX
    35°F / 2°C - 5.0 oz Climashield APEX
    Inside Length, w closed footbox
    For over-quilt use please go up one size from your base quilt. If over-quilting a mummy bag use your height as a reference for choosing the right length.
    Overall Width
    For over-quilt use please go up one size from your base bag/quilt.
    Footbox Size/Width
    The 38" footbox is based on a standard male size 10 foot.
    For over-quilt use please go up one or more sizes from your base bag/quilt.
    Footbox Style
    The Arc is light, snug, warm and permanently closed. Simple and foolproof .

    The Vector quickly converts from open blanket to closed cold weather comfort. Adjustable girth for winter over-quilt use. Quicker drying.
    Full Length Zipper
    This underside zipper running from head to foot turns the Gamut into a hybrid sleeping bag/quilt. Best if combined with a 62" or wider shoulder width.
    Shell Fabric

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

    Liner Fabric
    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.