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Seamless Down Hugger 900 #2

Style #1121349

  • 25℉
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Price: $499.00 $0.00

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Since 1975, Montbell has been innovating and creating better outdoor sleeping experiences with our sleeping bags. The Seamless Down Hugger series came about when we asked ourselves “How can we improve the down's ability to insulate?" When fully lofted, down traps air which provides insulation. The more air in the sleeping bag, the better it insulates. We began scrutinizing the elements of the sleeping bag that affect lofting ability. An idea proposed was to eliminate the baffles. Without baffles, the down would be unhindered and could loft to its fullest potential. But baffles prevent down from shifting and developing cold spots. Our next hurdle was developing a baffle replacement. Mother Nature provided inspiration and we developed a specialized thread called Spider Yarn. By placing a web-like layer of polyester yarns throughout the bag, we created a system that traps down and holds it in place. The "Spider Baffle System" was successful in maintaining a set amount of down, though a majority of the down is still able to move freely inside the bag. Although we’ve eliminated most of the exterior sewing lines, the interior features gathered quilts and elasticized stitching to promote comfort. By designing the sleeping bag in this way we’re able to reduce the amount of down used in the sleeping bag while maintaining the same thermal profile. This reduces some weight and provides a better value to our customers.



Updated 12/07/23 23:35 (EST)

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  • Spider Baffle System (Patent pending)
  • Inner: Super Spiral Stretch System (US. Patent NO. 7,900,301)
  • Two way right hand zipper (59 in / 150 cm)
  • Anti-snagging slider cover
  • Neck Baffle
  • Hood Adjuster (Draw cord for face hole adjustment)
  • Draft Tube (covering the zipper to shut out cold air)
  • Auto Locking Zipper (to limit zipper ”slip” during the night)
  • Triangle Gusset (Reinforcement at the end of the zipper)
  • Storage / laundry net sack included
  • Stuff sack included (Tapered, bias stretch stuff sack for easier packing)


Weight1 lb 7.1 oz (656 g)
Insulation900 Fill Power EX Down
Material7-denier Ballistic Airlight nylon (water repellent finish)
Spider Yarn: 100% polyester
Compressed size∅5.9 x 11.7 in (∅15 x 30 cm), 4.7 L
Country of originVIETNAM
OtherISO TESTED: 32°F / 0°C (Comfort), 21°F / -6°C (Lower Limit)
Max User Height: 6 ft / 183 cm

<Montbell sleeping bags stretch>
Shoulder girth when relaxed: 59 in / 149 cm
Shoulder girth when stretched: 76 in / 194 cm
Knee girth when relaxed: 48 in / 123 cm
Knee girth when stretch: 63 in / 160 cm

Baffleless Construction

How to wash & dry - Seamless Down Hugger 900 & 800 -

Down Sourcing

At Montbell, we source down from both the European and Asian markets to satisfy a variety of characteristics (supply/availability, low cost, consistent quality, humane practices, etc.) and maintain our lofty standards. Every season we seek to balance the superior quality for which we are known and the lowest possible raw materials cost. We change down sourcing companies frequently to insure that our customers have access to superior products at the lowest price possible. In the course of these efforts, Montbell never purchases down from operations that practice “live-plucking” methods. We only utilize down plumes and feathers collected as a by-product of water fowl raised to meet the demands of the food industry.

We will continue to look for sources of down that maximize value to our customers and allow Montbell products to perform at the highest level.

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.

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