Super UL Nano Blanket Configuration Page

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Nano Blankets are specialist tools with room for broader appeal.

40° rating, super compact stuffed size, ultralight. Versatile, essential, inspiring. SUL.

 Extensive custom options are offered to dial in critical details.

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Custom item.4-6 weeks lead time.


From blanket to quilt

In it's basic rendition the 40° Nano is a tapered rectangular backcountry comforter made with gossamer light fabrics and high fill power goose down.

It is as light and compact as is currently possible. All clutter has been removed. In this configuration there's no Velcro, no shockcords, no snaps. Only pure function remain: 0.66 ounce per square yard Membrane shell and liner. ¾" box baffled construction. 900 FP down. 

Stepping up in features from the comforter mode gradually evolve the Nano Blanket towards full quilt mode, based around the original 40° rating. Shockcord channels can be added at the foot end or top end, or both. Using specially sourced 1/16" shockcord and minimalist cord locks each channel adds about 12 grams, depending on blanket width. 

The next step is further sealing of the foot end to the level of regular quilts. Either a Vector convertible footbox can be added, or the permanently closed ARC. Both of those options automatically adjust the overall length to ensure effective coverage.

The underbody straps many quilt owners use to control drafts complete the upgrades needed to turn the basic Nano to a full Nunatak quilt. However, in a nod to SUL philosophies, these are merely comprised of 1/16" shockcord and tiny captive cordlocks. 


The Nano Blanket is custom built with 8 lengths and 5 shoulder widths available in any combination. Add to this three foot end sizes. And, if these 120 sizes are not sufficient for you - just email 

Fabric Technology

The 0.66 Membrane shell and liner fabric is optimally suited for an application like this. Few, if any, materials on the market today are as light as Membrane. Being a taffeta style fabric without the bulk and weight concentrated in a ripstop grid, the overall resistance to wear is very good for such a thin material. Two colors of Membrane are offered, both on the darker side to aid in heat absorption and drying: black and an attractive dark blue. 

0.8 Pertex Quantum shell fabric in Mountain Safety Orange is available for applications where ultimate hi-viz is desirable. Fractions of an ounce heavier than Membrane, this fabric is very bright, aiding in rescue situations. The Pertex is also offered in green and black.

Down Type

Select 900 fill power down for lightest weight and bulk. Only white goose down used - responsibly sourced and of the highest quality. Choose between regular and Hyper-Dry moisture resistant varieties.

The silnylon stuff sack supplied is 11-16 grams.

Possible uses for Nano Blankets:

Boost-liner for old tired mummy bags.

Emergency or planned bivys.

Recovery/rest blanket for: Ultra running, FKT attempts, adventure racing.

Warm-up blanket for backcountry skiing and other winter activities.

Home or camping comforter.

Safety net for committing day hikes.

Summit day just-in-case bivy.

Backcountry trauma/shock control.

Hammock underquilt (with some user mods!)


Full fledged quilt with the appropriate options selected, such as bottom and top closures, and strap package.


The tables below outline the total weight of the bare bones Nano blanket. The optional features available in the configuration menu include an estimate of how much they increase the weight.

All the numbers are subject to change and include a 5% margin of error.

The silnylon stuff sack supplied is 11-16 grams.

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Super UL Nano Blanket Configuration Page

Super UL Nano Blanket Configuration Page

Nano Blankets are specialist tools with room for broader appeal.

40° rating, super compact stuffed size, ultralight. Versatile, essential, inspiring. SUL.

 Extensive custom options are offered to dial in critical details.

Product Options
Temperature Rating
Overall Length
Length of blanket lying flat with any (optional) closures undone.
If choosing foot end closures add 5" to the length here to make up for the bunching and shortening that occurs when drawing the foot end closed.
Shoulder Width
The width across the blanket at the top and about 3' down, with any (optional) closures undone
Foot End Width
The width across the blanket at the foot end, with any (optional) closures undone
Top End Closure
A standard quilt style drawcord across the top hem is the option here, and adds 14 grams depending on size.
Elastic Drawcord in Channel, adds 12-14g
Foot End Closure
The three upgrade options transfer the Nano Blanket to more thermally efficient foot area.

Option 1 is a simple shockcord to gather up the end, and adds about 12 grams. This is the super minimalist way of getting a little more foot enclosure.

Option 2 is our hybrid open/ fully closed footbox, using Option One plus Velcro lengthwise on the bottom. Note: depending on width, this option increases the weight 40g to 80g.

Option 3 is the Arc style permanently closed foot end. Note: depending on foot end width this option adds 20g to 30g.
Elastic Drawcord in Channel, adds 10-14g
Drawcord/Velcro, Enabling a Fully Closed Footbox
Permanently Closed Arc style Footbox
Foot End Sleeve for Ground Pad
A 24" deep sleeve for inserting the foot end of a ground pad. This is a way of making a really narrow foot section more thermally efficient. Can also add utility without the use of a pad.

It can be combined with the foot drawcord option above for further control. NOT compatible with option 2 and 3 in the Foot End Closure field.

Adds under an ounce. The silnylon option is tougher, while the Membrane is the lightest.
No Thanks!
Silnylon Sleeve, adds 20-25g
Membrane Sleeve, adds 12-16g
Shell Fabric
The weight savings choosing .66 over .8 is 16 grams for a size 78" x 54" quilt.
Liner Fabric
Down Overfill
Strap Package
This option adds 4 grams of non-removable hardware. The shock cords are an additional 6g
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.
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.