Western Mountaineering Bison Gore Windstopper -40°C Sleeping Bag
Out-of-stock
Denali, Aconcagua, Himalaya… mountaineering in its extreme sense. These are places where mistakes cannot be made and so the Bison is most often chosen to serve. Read more..
Special Order: Special Order request is available. Contact [email protected]
Denali, Aconcagua, Himalaya… mountaineering in its extreme sense. These are places where mistakes cannot be made and so the Bison is most often chosen to serve. Gore Windstopper™ fabric makes this bag impervious to the elements while remaining lightweight and very compressible. Crammed with 42 ounces of 850+ fill power down this bag has 10 abundant inches of heat trapping loft. Huge V-Block Side Baffles and horizontal baffles across your chest keep the down fill in place. Double Interlocking Draft Tubes and a down filled Gore Windstopper™ collar seal in heat and security while howling winds surround your tent. The massive hood is not only well filled but is completely made with Gore Windstopper™ fabric and has a large integral hood ruff to seal your face from the elements. The Bison is the crowning glory of Western Mountaineering and demonstrates our commitment to innovation and quality.
- 5 1/4″ Spacing/V-Block Side Baffle
- 64″/39″ Shoulder/Foot Girth
- Full Down Collar
- Insulated External Hood Ruff
- Offset Insulated Double Draft Tubes.
- 10″ Loft, -40° F
- 42 oz. Down Fill
- 4 lbs. 10 oz. Total Weight
Weight
2095g (Size 180cm) / 2180g (Size 200cm)
Ideal Use
Winter and Expedition Camping
Season Rating
Winter
Temperature Rating
-40°C (-40°F)
EN Temperature Rating
-
Sleep Capacity
1-person
Length
Fits up to 6'0" (Size 180cm) / Fits up to 6'6" (Size 200cm)
Sleeping Bag Shape
Mummy
Fill Weight
1190g (Size 180cm) / 1275g (Size 200cm)
Fill / Insulation
Down Fill
Shell
Gore Windstopper™ Fabric
Compressed Volume
28cm x 55cm
Recommended Compression Sack
32L
Loft
27cm
Shoulder Girth
163cm
Hip Girth
140cm
Foot Girth
99cm
Additional Features
Stuff sack included
Product Sustainability
-
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| Men | Women |
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| 4 US M / 35.5 EUR | 5.5 US W / 35.5 EUR |
| 4.5 US M / 36 EUR | 6 US W / 36 EUR |
| 5 US M / 37 EUR | 6.5 US W / 37 EUR |
| 5.5 US M / 37.5 EUR | 7 US W / 37.5 EUR |
| 6 US M / 38 EUR | 7.5 US W / 38 EUR |
| 6.5 US M / 39 EUR | 8 US W / 39 EUR |
| 7 US M / 39.5 EUR | 8.5 US W / 39.5 EUR |
| 7.5 US M / 40 EUR | 9 US W / 40 EUR |
| 8 US M / 41 EUR | 9.5 US W / 41 EUR |
| 8.5 US M / 41.5 EUR | 10 US W / 41.5 EUR |
| 9 US M / 42 EUR | 10.5 US W / 42 EUR |
| 9.5 US M / 42.5 EUR | 11 US W / 42.5 EUR |
| 10 US M / 43 EUR | 11.5 US W / 43 EUR |
| 10.5 US M / 44 EUR | 12 US W / 44 EUR |
| 11 US M / 44.5 EUR | 12.5 US W / 44.5 EUR |
| 11.5 US M / 45 EUR | 13 US W / 45 EUR |
| 12 US M / 46 EUR | |
| 12.5 US M / 46.5 EUR | |
| 13 US M / 47 EUR | |
| 13.5 US M / 48 EUR | |
| 14 US M / 48.5 EUR | |
| 15 US M / 49.5 EUR |
Boreal Size Chart
Climbing Shoes / Footwear
| Men | Women |
|---|---|
| 5 US W / 35 EUR | |
| 5.5 US W / 35.5 EUR | |
| 6 US W / 36.25 EUR | |
| 5 US M / 37 EUR | 6.5 US W / 37 EUR |
| 5.5 US M / 37.5 EUR | 7 US W / 37.5 EUR |
| 6 US M / 38 EUR | 7.5 US W / 38 EUR |
| 6.5 US M / 38.75 EUR | 8 US W / 38.75 EUR |
| 7 US M / 39.5 EUR | 8.5 US W / 39.5 EUR |
| 7.5 US M / 40 EUR | 9 US W / 40 EUR |
| 8 US M / 40.75 EUR | 9.5 US W / 40.75 EUR |
| 8.5 US M / 41.25 EUR | 10 US W / 41.25 EUR |
| 9 US M / 42 EUR | 10.5 US W / 42 EUR |
| 9.5 US M / 42.5 EUR | 11 US W / 42.5 EUR |
| 10 US M / 43.25 EUR | |
| 10.5 US M / 44 EUR | |
| 11 US M / 44.5 EUR | |
| 11.5 US M / 45.25 EUR | |
| 12 US M / 46 EUR | |
| 12.5 US M / 46.5 EUR | |
| 13 US M / 47 EUR |
Evolv Size Chart
Climbing Shoes
Note: THIS SIZE GUIDE IS ONLY APPLICABLE TO THESE MODELS: Defy, Defy Lace, Geshido, Geshido Lace, Kronos, Phantom, Phantom LV, Rave, Shaman, Shaman LV, Shaman Lace, Shaman Lace LV, Zenist.
| Men | Women |
|---|---|
| 4 US M / 35.5 EUR | 5 US W / 35.5 EUR |
| 4.5 US M / 36 EUR | 5.5 US W / 36 EUR |
| 5 US M / 37 EUR | 6 US W / 37 EUR |
| 5.5 US M / 37.5 EUR | 6.5 US W / 37.5 EUR |
| 6 US M / 38 EUR | 7 US W / 38 EUR |
| 6.5 US M / 39 EUR | 7.5 US W / 39 EUR |
| 7 US M / 39.5 EUR | 8 US W / 39.5 EUR |
| 7.5 US M / 40 EUR | 8.5 US W / 40 EUR |
| 8 US M / 41 EUR | 9 US W / 41 EUR |
| 8.5 US M / 41.5 EUR | 9.5 US W / 41.5 EUR |
| 9 US M / 42 EUR | 10 US W / 42 EUR |
| 9.5 US M / 42.5 EUR | 10.5 US W / 42.5 EUR |
| 10 US M / 43 EUR | 11 US W / 43 EUR |
| 10.5 US M / 44 EUR | 11.5 US W / 44 EUR |
| 11 US M / 44.5 EUR | 12 US W / 44.5 EUR |
| 11.5 US M / 45 EUR | 12.5 US W / 45 EUR |
| 12 US M / 46 EUR | 13 US W / 46 EUR |
| 12.5 US M / 46.5 EUR | 13.5 US W / 46.5 EUR |
| 13 US M / 47 EUR | 14 US W / 47 EUR |
| 13.5 US M / 48 EUR | 14.5 US W / 48 EUR |
| 14 US M / 48.5 EUR | 15 US W / 48.5 EUR |
| 15 US M / 49.5 EUR | 16 US W / 49.5 EUR |
Street Shoes
| Men | Women | Kids |
|---|---|---|
| 2 US M / 33 EUR | 3 US W / 33 EUR | 11 US K / 29 EUR |
| 2.5 US M / 34 EUR | 3.5 US W / 34 EUR | 12 US K / 30 EUR |
| 3 US M / 34.5 EUR | 4 US W / 34.5 EUR | 13 US K / 31 EUR |
| 3.5 US M / 35 EUR | 4.5 US W / 35 EUR | 1 US K / 32 EUR |
| 4 US M / 35.5 EUR | 5 US W / 35.5 EUR | 2 US K / 33 EUR |
| 4.5 US M / 36 EUR | 5.5 US W / 36 EUR | 3 US K / 34.5 EUR |
| 5 US M / 37 EUR | 6 US W / 37 EUR | 4 US K / 35.5 EUR |
| 5.5 US M / 37.5 EUR | 6.5 US W / 37.5 EUR | 5 US K / 37 EUR |
| 6 US M / 38 EUR | 7 US W / 38 EUR | |
| 6.5 US M / 39 EUR | 7.5 US W / 39 EUR | |
| 7 US M / 39.5 EUR | 8 US W / 39.5 EUR | |
| 7.5 US M / 40 EUR | 8.5 US W / 40 EUR | |
| 8 US M / 41 EUR | 9 US W / 41 EUR | |
| 8.5 US M / 41.5 EUR | 9.5 US W / 41.5 EUR | |
| 9 US M / 42 EUR | 10 US W / 42 EUR | |
| 9.5 US M / 42.5 EUR | 10.5 US W / 42.5 EUR | |
| 10 US M / 43 EUR | 11 US W / 43 EUR | |
| 10.5 US M / 44 EUR | 11.5 US W / 44 EUR | |
| 11 US M / 44.5 EUR | 12 US W / 44.5 EUR | |
| 11.5 US M / 45 EUR | 12.5 US W / 45 EUR | |
| 12 US M / 46 EUR | 13 US W / 46 EUR | |
| 12.5 US M / 46.5 EUR | 13.5 US W / 46.5 EUR | |
| 13 US M / 47 EUR | 14 US W / 47 EUR | |
| 13.5 US M / 48 EUR | 14.5 US W / 48 EUR | |
| 14 US M / 48.5 EUR | 15 US W / 48.5 EUR | |
| 15 US M / 49.5 EUR | 16 US W / 49.5 EUR | |
| 16 US M / 50 EUR | 17.5 US W / 50 EUR |
Five Ten
Climbing Shoes / Footwear
| Men | Women |
|---|---|
| 4 US M / 36 EUR | 5 US W / 36 EUR |
| 4.5 US M / 36 2/3 EUR | 5.5 US W / 36 2/3 EUR |
| 5 US M / 37 1/3 EUR | 6 US W / 37 1/3 EUR |
| 5.5 US M / 38 EUR | 6.5 US W / 38 EUR |
| 6 US M / 38 2/3 EUR | 7 US W / 38 2/3 EUR |
| 6.5 US M / 39 1/3 EUR | 7.5 US W / 39 1/3 EUR |
| 7 US M / 40 EUR | 8 US W / 40 EUR |
| 7.5 US M / 40 2/3 EUR | 8.5 US W / 40 2/3 EUR |
| 8 US M / 41 1/3 EUR | 9 US W / 41 1/3 EUR |
| 8.5 US M / 42 EUR | 9.5 US W / 42 EUR |
| 9 US M / 42 2/3 EUR | 10 US W / 42 2/3 EUR |
| 9.5 US M / 43 1/3 EUR | 10.5 US W / 43 1/3 EUR |
| 10 US M / 44 EUR | 11 US W / 44 EUR |
| 10.5 US M / 44 2/3 EUR | 11.5 US W / 44 2/3 EUR |
| 11 US M / 45 1/3 EUR | 12 US W / 45 1/3 EUR |
| 11.5 US M / 46 EUR | 12.5 US W / 46 EUR |
| 12 US M / 46 2/3 EUR | 13 US W / 46 2/3 EUR |
| 12.5 US M / 47 1/3 EUR | 13.5 US W / 47 1/3 EUR |
| 13 US M / 48 EUR | 14 US W / 48 EUR |
| 13.5 US M / 48 2/3 EUR | 14.5 US W / 48 2/3 EUR |
| 14 US M / 49 1/3 EUR | 15 US W / 49 1/3 EUR |
| 14.5 US M / 50 EUR | 15.5 US W / 50 EUR |
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| Men | Women |
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| 2.5 US W / 33 EUR | |
| 3 US W / 33.5 EUR | |
| 2.5+ US M / 34 EUR | 3.5 US W / 34 EUR |
| 3 US M / 34.5 EUR | 4 US W / 34.5 EUR |
| 3.5 US M / 35 EUR | 4.5 US W / 35 EUR |
| 4 US M / 35.5 EUR | 5 US W / 35.5 EUR |
| 4.5 US M / 36 EUR | 5.5 US W / 36 EUR |
| 4.5+ US M / 36.5 EUR | 5.5+ US W / 36.5 EUR |
| 5 US M / 37 EUR | 6 US W / 37 EUR |
| 5.5 US M / 37.5 EUR | 6.5 US W / 37.5 EUR |
| 6 US M / 38 EUR | 7 US W / 38 EUR |
| 6.5 US M / 38.5 EUR | 7.5 US W / 38.5 EUR |
| 6.5+ US M / 39 EUR | 7.5+ US W / 39 EUR |
| 7 US M / 39.5 EUR | 8 US W / 39.5 EUR |
| 7.5 US M / 40 EUR | 8.5 US W / 40 EUR |
| 8 US M / 40.5 EUR | 9 US W / 40.5 EUR |
| 8.5 US M / 41 EUR | 9.5 US W / 41 EUR |
| 8.5+ US M / 41.5 EUR | 9.5+ US W / 41.5 EUR |
| 9 US M / 42 EUR | 10 US W / 42 EUR |
| 9.5 US M / 42.5 EUR | 10.5 US W / 42.5 EUR |
| 10 US M / 43 EUR | 11 US W / 43 EUR |
| 10.5 US M / 43.5 EUR | 11.5 US W / 43.5 EUR |
| 10.5+ US M / 44 EUR | 11.5+ US W / 44 EUR |
| 11 US M / 44.5 EUR | 12 US W / 44.5 EUR |
| 11.5 US M / 45 EUR | 12.5 US W / 45 EUR |
| 12 US M / 45.5 EUR | 13 US W / 45.5 EUR |
| 12.5 US M / 46 EUR | 13.5 US W / 46 EUR |
| 12.5+ US M / 46.5 EUR | 13.5+ US W / 46.5 EUR |
| 13 US M / 47 EUR | 14 US W / 47 EUR |
| 13.5 US M / 47.5 EUR | |
| 14 US M / 48 EUR | |
| 15 US M / 49 EUR | |
| 16 US M / 50 EUR |
Madrock
Climbing Shoes
| Men | Women |
|---|---|
| 3 US M / 34.5 EUR | 4.5 US W / 34.5 EUR |
| 3.5 US M / 35 EUR | 5 US W / 35 EUR |
| 4 US M / 35.5 EUR | 5.5 US W / 35.5 EUR |
| 4.5 US M / 36 EUR | 6 US W / 36 EUR |
| 5 US M / 37 EUR | 6.5 US W / 37 EUR |
| 5.5 US M / 37.5 EUR | 7 US W / 37.5 EUR |
| 6 US M / 38 EUR | 7.5 US W / 38 EUR |
| 6.5 US M / 39 EUR | 8 US W / 39 EUR |
| 7 US M / 39.5 EUR | 8.5 US W / 39.5 EUR |
| 7.5 US M / 40 EUR | 9 US W / 40 EUR |
| 8 US M / 41 EUR | 9.5 US W / 41 EUR |
| 8.5 US M / 41.5 EUR | 10 US W / 41.5 EUR |
| 9 US M / 42 EUR | 10.5 US W / 42 EUR |
| 9.5 US M / 42.5 EUR | 11 US W / 42.5 EUR |
| 10 US M / 43 EUR | 11.5 US W / 43 EUR |
| 10.5 US M / 44 EUR | |
| 11 US M / 44.5 EUR | |
| 11.5 US M / 45 EUR | |
| 12 US M / 46 EUR | |
| 12.5 US M / 46.5 EUR | |
| 13 US M / 47 EUR | |
| 14 US M / 48.5 EUR | |
| 15 US M / 50 EUR |
Scarpa
Climbing Shoes / Footwear
| Men | Women | Kids |
|---|---|---|
| 3 US M / 34.5 EUR | 4 US W / 34.5 EUR | 9 US K / 27-28 EUR |
| 3.5 US M / 35 EUR | 4.5 US W / 35 EUR | 11 US K / 29-30 EUR |
| 4 US M / 35.5 EUR | 5 US W / 35.5 EUR | 12.5 US K / 31-32 EUR |
| 4.5 US M / 36 EUR | 5.5 US W / 36 EUR | 1 US K / 33-34 EUR |
| 4 2/3 US M / 36.5 EUR | 5 2/3 US W / 36.5 EUR | 2.5 US K / 35-36 EUR |
| 5 US M / 37 EUR | 6 US W / 37 EUR | |
| 5.5 US M / 37.5 EUR | 6.5 US W / 37.5 EUR | |
| 6 US M / 38 EUR | 7 US W / 38 EUR | |
| 6 1/3 US M / 38.5 EUR | 7 1/3 US W / 38.5 EUR | |
| 6.5 US M / 39 EUR | 7.5 US W / 39 EUR | |
| 7 US M / 39.5 EUR | 8 US W / 39.5 EUR | |
| 7.5 US M / 40 EUR | 8.5 US W / 40 EUR | |
| 7 2/3 US M / 40.5 EUR | 8 2/3 US W / 40.5 EUR | |
| 8 US M / 41 EUR | 9 US W / 41 EUR | |
| 8.5 US M / 41.5 EUR | 9.5 US W / 41.5 EUR | |
| 9 US M / 42 EUR | 10 US W / 42 EUR | |
| 9.5 US M / 42.5 EUR | 10.5 US W / 42.5 EUR | |
| 10 US M / 43 EUR | 11 US W / 43 EUR | |
| 10 1/3 US M / 43.5 EUR | 11 1/3 US W / 43.5 EUR | |
| 10.5 US M / 44 EUR | 11.5 US W / 44 EUR | |
| 11 US M / 44.5 EUR | 12 US W / 44.5 EUR | |
| 11.5 US M / 45 EUR | 12.5 US W / 45 EUR | |
| 11 2/3 US M / 45.5 EUR | 12 2/3 US W / 45.5 EUR | |
| 12 US M / 46 EUR | 13 US W / 46 EUR | |
| 12.5 US M / 46.5 EUR | 13.5 US W / 46.5 EUR | |
| 13 US M / 47 EUR | 14 US W / 47 EUR | |
| 13.5 US M / 47.5 EUR | 14.5 US W / 47.5 EUR | |
| 14 US M / 48 EUR | 15 US W / 48 EUR | |
| 14.5 US M / 49 EUR | 15.5 US W / 49 EUR | |
| 15 US M / 50 EUR | 16 US W / 50 EUR |
Tenaya Size Chart
Climbing Shoes
| Men | Women |
|---|---|
| 2 US M / 33 EUR | 3 US W / 33 EUR |
| 2.5 US M / 33.6 EUR | 3.5 US W / 33.6 EUR |
| 3 US M / 34.3 EUR | 4 US W / 34.3 EUR |
| 3.5 US M / 35 EUR | 4.5 US W / 35 EUR |
| 4 US M / 35.6 EUR | 5 US W / 35.6 EUR |
| 4.5 US M / 36.2 EUR | 5.5 US W / 36.2 EUR |
| 5 US M / 36.8 EUR | 6 US W / 36.8 EUR |
| 5.5 US M / 37.5 EUR | 6.5 US W / 37.5 EUR |
| 6 US M / 38.1 EUR | 7 US W / 38.1 EUR |
| 6.5 US M / 38.8 EUR | 7.5 US W / 38.8 EUR |
| 7 US M / 39.4 EUR | 8 US W / 39.4 EUR |
| 7.5 US M / 40 EUR | 8.5 US W / 40 EUR |
| 8 US M / 40.7 EUR | 9 US W / 40.7 EUR |
| 8.5 US M / 41.3 EUR | 9.5 US W / 41.3 EUR |
| 9 US M / 42 EUR | 10 US W / 42 EUR |
| 9.5 US M / 42.6 EUR | 10.5 US W / 42.6 EUR |
| 10 US M / 43.2 EUR | 11 US W / 43.2 EUR |
| 10.5 US M / 43.9 EUR | 11.5 US W / 43.9 EUR |
| 11 US M / 44.5 EUR | 12 US W / 44.5 EUR |
| 11.5 US M / 45.2 EUR | 12.5 US W / 45.2 EUR |
| 12 US M / 45.8 EUR | 13 US W / 45.8 EUR |
| 12.5 US M / 46.5 EUR | 13.5 US W / 46.5 EUR |
| 13 US M / 47.1 EUR | 14 US W / 47.1 EUR |
| 13.5 US M / 47.7 EUR | 14.5 US W / 47.7 EUR |
| 14 US M / 48.3 EUR | 15 US W / 48.3 EUR |
Unparallel Size Chart
Climbing Shoes
| Men | Women |
|---|---|
| 2 US M / 33 EUR | |
| 2.5 US M / 34 EUR | 4 US W / 34 EUR |
| 3 US M / 34.5 EUR | 4.5 US W / 34.5 EUR |
| 3.5 US M / 35 EUR | 5 US W / 35 EUR |
| 4 US M / 35.5 EUR | 5.5 US W / 35.5 EUR |
| 4.5 US M / 36 EUR | 6 US W / 36 EUR |
| 5 US M / 37 EUR | 6.5 US W / 37 EUR |
| 5.5 US M / 37.5 EUR | 7 US W / 37.5 EUR |
| 6 US M / 38 EUR | 7.5 US W / 38 EUR |
| 6.5 US M / 39 EUR | 8 US W / 39 EUR |
| 7 US M / 39.5 EUR | 8.5 US W / 39.5 EUR |
| 7.5 US M / 40 EUR | 9 US W / 40 EUR |
| 8 US M / 41 EUR | 9.5 US W / 41 EUR |
| 8.5 US M / 41.5 EUR | 10 US W / 41.5 EUR |
| 9 US M / 42 EUR | 10.5 US W / 42 EUR |
| 9.5 US M / 42.5 EUR | 11 US W / 42.5 EUR |
| 10 US M / 43 EUR | |
| 10.5 US M / 44 EUR | |
| 11 US M / 44.5 EUR | |
| 11.5 US M / 45 EUR | |
| 12 US M / 46 EUR | |
| 12.5 US M / 46.5 EUR | |
| 13 US M / 47 EUR | |
| 13.5 US M / 48 EUR | |
| 14 US M / 48.5 EUR | |
| 15 US M / 49.5 EUR |