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.
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A few things to keep in mind:
These quilts are designed to provide sleeping comfort in the western US mountains from April to October.
The 20° rated Arc UL is the standard go-to, do anything quilt. Our most popular choice for long-distance hikers ready to keep going into fall.
With the 15°F quilt cold sleepers get a boost in loft.
Fill and Loft
The 900 fp down loft is a between 2.60” and 2.95”. Fill volumes for either level are detailed in the charts.
The length is in 4" increments. The chart numbers interprets where the quilt top is 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 size up if in doubt. Bags and quilts cut too short tends to compress the foot area insulation to the detriment of cold toes.
Adequate width in the shoulder to hip region is crucial for sleep comfort and draft control. A ball park figure to achieve optimal performance is your shoulder circumference plus 6"-10". The Arc UL does not taper inwards until below hip level.
Newcomers to backcountry quilts can also experiment with a blanket before committing to a width.
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
More details on the Fabric Page, found in the top menu under Materials.
Ultralight: 10d ultralight breathable shell.
This ultralight fabric creates a comfortable sleep environment at the lowest weight. While providing very little protection from moisture, the superior breathability allows it to dry quickly in the sun. Ideal for users seeking the lowest weight.
Classic: 15d lightweight breathable shell.
Same non-existent moisture protection as the 10d above, but a significant increase in durability and tear strength. Expect a weight gain up to one ounce, depending on size.
Moisture protection for select areas: 7d ultralight waterproof/breathable shell.
With 7d wp/b covering the outer foot section and top draft collar you can protect the down where it typically wets out 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.
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.
Liner Material Choices
Long term wear on quilt fabrics is most pronounced on the inside liner material. To anticipate this the Arc UL can be upgraded to our soft, durable 20d Taffeta black liner, specifically developed for sleeping bags. Expect one ounce of weight gain.
This optional synthetic Apex insulated bag is a booster option for extending the use of your quilt well into the colder season, while providing superior moisture management.
Depending on the user the overbag can add 15°F or more to the rating of your base quilt, while completely eliminating drafts. The latter is probably the most crucial element for a winter specific quilt based sleep system; and very hard to maintain with a quilt/quilt setup.
The dampness inevitably forming on the outer surface will mostly affect the quick drying synthetic while the down mass stays drier. This applies to body moisture pushed outward; and dew, frost and shelter induced condensation from the environment. For longer trips in inclement conditions this becomes a crucial aspect of staying warm.
This overbag is zipper-less with a closed mummy style foot box, and features a custom cut to match your quilt sizing specs and curvature thus avoiding excessive compression of the lofted down. A draw cord at the top seals in the warmth. It uses 2.5 oz weight Apex.
The fabric used is a highly breathable 10d nylon, with smooth taffeta inside and ripstop out. All black. Average weight is 15oz, with small variances depending on the base quilt.
Additional applications includes emergency and summer stand alone use.
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.