Home / Gear / Sleeping Bags / Seamless Down Hugger WR 900 #3 Long

Seamless Down Hugger WR 900 #3 Long

Style #1121346

  • 30℉

Price: $609.00

Member Points: 6,090

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. The WR lineup utilizes GORE-TEX INFINIUM™ with seam sealing to create a weatherproof sleeping bag for use in variable conditions.


BASM (Balsam)



Updated 10/29/20 08:35 (EST)


  • 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 (Draw cord for face hole adjustment)
  • Insulated Flap (covering the zipper to shut out cold air)
  • 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 6.1 oz (626 g)
Insulation900 Fill Power EX Down
13-denier Ballistic Airlight nylon ripstop
Lining: 7-denier Ballistic Airlight nylon
Spider Yarn: 100% Polyester
DWRStandard DWR treatment
Compressed size∅5.9 x 11.7 in (∅15 x 30 cm), 4.7 L
Country of originVIETNAM
OtherISO TESTED: 40℉ / 4℃ (Comfort), 30℉ / -1℃ (Lower Limit)
Max User Height: 6 ft 6 in / 198 cm
Shoulder Girth: 63 - 82 in / 160 - 208 cm
Knee Girth: 53- 69 in / 134 - 174 cm

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Actual color may vary.

Baffleless Construction

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


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.

ISO 23537


Montbell Sleeping Bag