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Seamless Down Hugger WR 900 #3

Style #1121391

  • 30℉

Price: $499.00

Member Points: 2,495    ?

An ultralight, state-of-the-art sleeping bag that uses baffle-less construction to achieve cutting-edge, weight-saving performance. The interior features gathered quilts and elasticized stitching for exceptional comfort. Seam-sealed GORE-TEX® Infinium makes this a weatherproof sleeping bag that excels in wet, variable conditions.


BASM (Balsam)



Updated 05/27/23 17:35 (EST)

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  • Spider Baffle System (Patent pending)
  • Inner: Super Spiral Stretch System (US. Patent NO. 7,900,301)
  • Fully Seam taped
  • Weather resistant Aqua-Tect Zipper
  • One way right hand zipper (31 in / 80 cm)
  • Anti-snagging slider cover
  • Hood Adjuster with draw cord for face hole adjustment
  • Insulated Flap covering the zipper to shut out cold air
  • Storage / laundry net sack included
  • Stuff sack included (Tapered, bias stretch stuff sack for easier packing)


Weight1 lb 3.6 oz (557 g)
Insulation900 Fill Power EX Down
13-denier Ballistic Airlight nylon ripstop
(DWR finish)
Lining: 7-denier Ballistic Airlight nylon ripstop
Spider Yarn: 93% Polyester + 7% Nylon
Compressed sizeØ5.5 x 10.9 in (Ø14 x 28 cm), 3.8 L
Country of originVIETNAM
OtherISO TESTED: 41°F/ 5°C (Comfort), 32°F / 0°C (Lower Limit)
Max User Height: 6 ft / 183 cm

<Montbell sleeping bags stretch>
Shoulder girth when relaxed: 53 in / 135 cm
Shoulder girth when stretched: 75 in / 190 cm
Knee girth when relaxed: 44 in / 111 cm
Knee girth when stretch: 61 in / 156 cm

Montbell Sleeping Bag


How to wash & dry - Seamless Down Hugger WR 900 -


Baffleless Construction

What is ISO 23537?

The International Organization for Standardization (ISO) develops and publishes international standards for all types of products. Based on the continued development of EN 13537, ISO 23537 is a test designed and performed by an independent third party that seeks to standardize the way temperature ratings or thermal guidelines are established for sleeping bags. All of Montbell’s sleeping bags are independently tested at the Institute for Environmental Research at Kansas State University.

<Testing Methods>
A full length mannequin covered “head to toe” with heaters and temperature sensors is outfitted with base layer top, bottom, hat and socks. The mannequin is place in the sleeping bag and both are put into a climate chamber. The mannequin is heated to simulate body warmth. The air temperature is measured in the chamber and on the surface of the mannequin. From these measurements, the thermal value of the sleeping bag can be calculated. Based on the measured insulating ability of the tested sleeping bag three temperature results or recommendations are provided.The following assumptions are used as the “gender standards” for all temperature calculations.
*Man (25 years old, 70 kilograms, 1.73 meters tall)
*Woman (25 years old, 60 kilograms, 1.6 meters tall)

<Temperature Ratings>
Based on the lowest temperature at which a “standard” adult woman is deemed able to have a comfortable night’s sleep.
Based on the lowest temperature at which a “standard” adult male is deemed able to have a comfortable night’s sleep.
This survival rating is established using the “adult woman” standard. It is not advisable for consumers to use the extreme or survival rating for general use. The best guideline temperatures for purchase decisions are the Comfort and Limit ratings.


Sleeping Bag Guide

The history and evolution of montbell sleeping bags