Arc UL 30°F - 25°F Custom Page

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Done for now. Pls check back in late March

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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Pay via Credit Card or Paypal Account

Done for now. Pls check back in late March

A few things to keep in mind:

  1. We measure the actual width from the finished quilt's inside, without stretching. 
  2. The differential cut makes the inside narrower/shorter than the outside.
  3. Our sizes are real life, so will get you a quilt generally wider/longer than other brands with similar specs.
  4. The measured length does not include the draft collar.

Appropriate use

These two quilts are designed to balance the lowest possible weight and bulk with the level of comfort needed in the western US mountains during the summer hiking season. 

The 30° Arc UL is warm enough to serve as a general purpose quilt for an experienced backpacker.

The 25°F is the sweet spot for folks not knowing if a changing climate really warrants a 20°F quilt anymore.

20°F and 15°F quilts are available here

Fill and Loft

The 900 fp down loft is a between 1.90” and 2.25”.  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 measured 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 an increase in durability and tear strength. Expect a weight gain up to one ounce, depending on size.

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 if selected full 20d inner, less than half an ounce for the foot area only.

What's in the box?

The quilt, a set of quilt straps, an optional silnylon stuffsack and a large breathable storage sack.

We also have additional articles with helpful pointers on selection and design:

Choosing the right Quilt

Designing with Down

Why Overfill?

Go to the bottom of this page for the full Arc UL Configuration Menu.

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Arc UL 30°F - 25°F Custom Page

Arc UL 30°F - 25°F Custom Page

Done for now. Pls check back in late March

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. 

Product Options
Temperature Rating

The rating reflects the lowest temperature during which a well conditioned hiker can expect to remain comfortable throughout a full night. Adequate shelter and ground pad must be used.

30°F / 0°C. Includes differential cut
25°F / -4°C. Includes differential cut
Inside Length
62" - Extra Small
66" - Small
70" - Medium
74" - Long
78" - Extra Long
Shoulder Width
50" Our narrowest size for slim folks who doesn’t toss and turn much; and experienced quilt users wishing to save weight.
56" The most popular size that fits most frames.
62" For bigger people and/or those who toss and turn.
68" Very wide quilt - sprawling coverage!
Footbox Size Circumference
Shell Material

Moroccan Blue Ripstop 10d - Lightest, most breathable
Grey Ripstop 10d - Lightest, most breathable
Purple Ripstop 10d - Lightest, most breathable
Forest Green Ripstop 10d - Lightest, most breathable
Dark Olive Ripstop 10d - Lightest, most breathable
Brilliant Blue Ripstop 15d - More durable, breathable
Black Ripstop 15d - More durable, breathable
Purple Ripstop 15d - More durable, breathable
Dark Olive 15d - More durable, breathable
Liner Material Options
Black 10d taffeta - Lightest, most breathable
Black 20d taffeta - Durable, soft and comfortable but about an ounce heavier!
10d black taffeta in torso section, more durable 20d taffeta in foot section
Down Type

Allied Expedry is a moisture resistant goose down treated with a chemical free, safe compound. Expedry helps reduce drying times while minimizing performance issues in wet weather. The treatment is long lasting and effective.

Untreated 900fp goose down only available on request.

900 Fill Power Goose Down, Expedry, RDS Certified
Down Overfill

Adding overfill can prolong the life of the down, help maintain loft during moist conditions, boost the temperature rating by a small amount and keep the down volume from shifting. For most quilts/bags the overfill amount ranges from 45-65 grams of extra down

No Thanks
Overfill in foot section
Overfill in torso section
Overfill evenly throughout
Edge Tension Control

This design involves two user adjustable shock cords running lengthwise along the left and right quilt edges. On cold nights tension the cords to shorten the edges and draw them under you; during milder conditions completely slacken the cords to have the blanket throw feel. 

Strap package
Yes, include pad attach and under-body straps
Stuff Sack
Yes, please include a stuff sack
No stuff sack