Mt Washington 4 Quilt by Jacks R Better

(1 customer review)


Conservatively rated to 0° F(-17° C) the Mt Washington 4 underquilt features a dual differential cut, body contouring design with constant height radial baffles.

Over-stuff: 25% over-stuff included!

1 in stock

weight: 913 g


No more waking up cold in the middle of the night! The Mt. Washington 4 hammock underquilt works on any hammock – including all gathered end hammocks and bridge hammocks. It attaches to a hammock in under a minute with the included JRB Suspension System.

All Jacks ‘R’ Better quilts are over stuffed by at least 25%. We do not recommend additional over stuffing.

Compression Sack: A lot of folks no longer use compressions sacks and instead keep their quilts dry inside a lawn contractor bag or trash compactor liner. We do not want anyone to have to pay for something they do not want so now we offer them separately. For 0 degree quilts we recommend the large size compression sack.

Activ-dri down™ – Activ-dri™ is a hydrophobic down treatment that keeps the down drier, while having no adverse effects on loft, fill power, or warmth retention. Activ-dri down is still down insulation and should be protected from direct exposure to moisture. All types of insulation, whether down or synthetic, will degrade in insulation capability if wetted.

The Mount Washington 4 hammock underquilt works on ENO Hammocks, Hennessy Hammocks, Warbonnet Hammocks, Dutchware Chameleon, as well as most other brands and DIY hammocks.

Mt. Washington, at 6288 feet, is the home of the world’s worst weather: bitter cold, heavy fog, deep snow, and incredible wind … occasionally a beautiful day. To tackle the winter’s worst conditions, Jacks ‘R’ Better has designed a unique hammock underquilt with a dual differential cut, body contoured design and constant height radial baffles to achieve a 0° capability. These are the most capable and warmest commercially available hammock underquilts.

Length: 77-inches (1.96 m)
Width: 42-inches (1.07 m)
Loft: 3.5-inches (8.9 cm)
Material: 1.1oz Ion fabric, 20 denier
Insulation: 800 fill power Activ-dri™ down
Weight: 28 ounces (794g)
Temperature Rating: 0° F (-17° C)

Additional information

Weight 913 g
Dimensions 1 × 1 × 1 in

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  1. One person found this helpful

    Lightweight luxury and confidence to use well below the temp rating.


    I purchased a Mt Washington 4 direct from JRB this past winter and have used it on several trips with driving wind and temps to the single digits. The suspension and ease of setup are welcome features when I’m cold and tired. I’ve been warm and comfortable every time that I’ve used this quilt, and I’m still amazed how a 4 season quilt packs down so small.

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