The Arc UL quilts are designed for optimal efficiency in the environments met by long distance hikers.Custom features including sizing and weight saving options.
This product is no longer in stock
40°F. Custom item. Multi week lead time.
The 40°F Arc UL is designed to balance the lowest possible weight and bulk with the level of comfort needed in the western US mountains during the height of the summer hiking season.
This is the 'go light and fast' choice with obvious compromises in cold weather ability.
Fill and Loft
The loft is a minimum of 1.25” Fill volume is detailed in the chart, and offer further insight into whether this quilt will meet your needs.
The length is in 4" increments defined by measurements plus X-Small to X-Long descriptors. Using this system you can choose how far up the quilt reaches when on your back. In open mode reaching just the chin level is the absolute shortest anyone should go, and then only on quilts for the warmer seasons. Reaching the user's 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 to the detriment of cold toes.
The shoulder and foot area widths can be customized for individual needs and sizing. Newcomers to backcountry quilts can experiment with a blanket before committing to a sizing setup.
Foot End Design
The traditional Arc design is a permanently closed section finished with a round bottom piece sewn in place. A design common with high-end mummy bags.
Shell Material Choices
Immediate apologies for the complexity of the following!
We offer the discerning user options to fine tune the performance of the Arc UL via a series of technical shell materials.
Basically there’s three distinct categories:
Classic: 10d ultralight breathable shell.
This ultralight choice creates a comfortable sleep environment at the lowest weight. It will, however, wet out and transfer moisture to the down if exposed to prolonged dew, mist and damp tents. On the other hand, the superior breathability allows it to dry quickly in the sun. Ideal for moderately dry weather, desert hikes and anyone with a traditional double walled tent.
Full Moisture protection: 7d ultralight waterproof/breathable shell.
With this as your outer material there’s minimal concern about external moisture migrating to the down. Also, the lesser breathability boosts the temperature rating a small amount.
The choice for wet environments, ‘cowboy camping’ and for users of flat tarps wanting to eliminate the bivy bag. The 7d wp/b is coated fabric, yet has a very light denier count, and as such adds under 5% to the total weight over the 10d option.
Combo of above two: A combination of 10d breathable and 7d wp/b shells.
With 7d wp/b only covering the outer foot section and top draft collar you can protect the down where it matters the most, while leaving the large mid section fully breathable. For use in the modern single wall tent where rampant condensation often collides with the lower end of sleeping bags. Also, the draft collar is protected from moist exhalations. A very versatile setup.
Look closely at the configuration table below, in order to select precisely what suits your use.
Liner Material Choices
The worst long term wear on quilt fabrics is the inside liner material. If you want to break with true UltraLight traditions, and risk adding up to 2 ounces (!!) of weight, the Arc UL can be upgraded to our soft, durable 20d Taffeta black liner, specifically developed for sleeping bags.
Besides the custom sourced shell and liner materials, we also consider shock cords, buckles, snaps and other notions as specific targets for UL optimization, further shaving grams.
What's in the box?
The quilt, a set of quilt straps, a silnylon stuffsack and a large breathable storage sack.
We also have additional articles with helpful pointers on selection and design:
Go to the bottom of this page for the full Arc UL Configuration Menu.
Arc UL 40°F in the stock olive 10d shell with upgraded black waterproof/breathable 7d foot and collar.
* required fields