SELECTING A SLEEPING BAG

Red Fox was born in the mountains where weight becomes a penalty and warmth is your friend. Therefore we put a premium on balancing lightweight with warmth for a reasonable price. For natural goose down the dominant factor affecting warmth is the thickness of the insulator,  so we adjust baffle depths for the temperature range you're looking for. With synthetic fibers, density can add warmth with reduced bulk. Whether or not you chose goose down or synthetic fibers is based on your budget and how damp conditions in the wild will be. Our down has a waterproof treatment but we still recommend hydrophobic Omnitherm® synthetic insulation if you expect damp conditions. Otherwise, nothing is as light and warm as all natural down.

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Warm weather sleeping bags, or for those who sleep hot in cooler temps.


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Rapid a.03

1 lb., 12 oz. • 0.8 kg

55° to 20°F
20° to -5°C
  • 700+ fill power goose down insulation
  • Down can shift between top and bottom
  • Snorkel tube hood
  • Pillow pocket
  • Draft tube on main zipper & collar
  • Internal key pocket

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Yeti SR

2 lb., 1 oz. • 0.95 kg

55° to 7°F
6° to -14°C
  • 650+ fill power goose down insulation
  • Zips open to become comforter for two
  • Thick, rectangular baffles
  • Lots of leg room
  • Draft tube on main zipper & collar
  • Lightweight breathable nylon shell with DWR

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Arctic SR

2 lb., 12 oz. • 1.23 kg

55° to 7°F
6° to -14°C
  • Omnitherm® synthetic insulation
  • Shingled baffle construction
  • Unzips to become comforter for two
  • Lots of leg room
  • Draft tube on main zipper
  • Internal key pocket

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Arctic -15

1 lb., 12 oz. • 0.8 kg

55° to 20°F
20° to -5°C
  • Omnitherm® synthetic insulation
  • Shingled baffle construction
  • Snorkel tube hood
  • Fleece lined toebox
  • Draft tube on main zipper
  • Internal key pocket

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For when there's a nip in the air and some weather is coming in. Not quite warm enough for snow camping, but cozy on a cool autumn night. 


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Rapid a.02

2 lb., 1 oz. • 0.93 kg

40° to 0°F
3.5° to -17°C
  • 700+ fill power goose down insulation
  • Down can shift between top and bottom
  • Snorkel tube hood
  • Pillow pocket
  • Draft tube on main zipper & collar
  • Internal key pocket

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Yeti -20

3 lb., 2 oz. • 1.43 kg

37° to -4°F
2° to -20°C
  • 650+ fill power goose down insulation
  • Mummy bag with snorkel hood
  • Thick, rectangular baffles
  • Lots of leg room
  • Draft tube on main zipper & collar
  • Lightweight breathable nylon shell with DWR

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Arctic -20

3 lb., 5 oz. • 1.5 kg

37° to -4°F
8° to -15°C
  • Omnitherm® synthetic insulation
  • Shingled baffle construction
  • Mummy bag with snorkel hood
  • Fleece-line toe box
  • Draft tube on main zipper & collar
  • Internal key pocket

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When adventure comes dressed in snow, these are the bags you go out there with. No compromise. No complaints.  


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Rapid a.01

2 lb., 1 oz. • 1.45 kg

26° to -35°F
-3° to -28°C
  • 700+ fill power goose down insulation
  • Down can shift between top and bottom
  • Snorkel tube hood
  • Pillow pocket
  • Draft tube on main zipper & collar
  • Internal key pocket

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Yeti -30

3 lb., 11 oz. • 1.67 kg

23° to -22°F
-5° to -30°C
  • 650+ fill power goose down insulation
  • Mummy bag with snorkel hood
  • Thick, rectangular baffles
  • Lots of leg room
  • Draft tube on main zipper & collar
  • Lightweight breathable nylon shell with DWR

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Arctic -30

4 lb., 10 oz. • 2.1 kg

25° to -18°F
-4° to -28°C
  • Omnitherm® synthetic insulation
  • Shingled baffle construction
  • Mummy bag with snorkel hood
  • Fleece-line toe box
  • Draft tube on main zipper & collar
  • Internal key pocket

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Arctic cold is unrelenting. Even lethal. We built these sleeping bags to win the war of warmth so you can recharge for tomorrow's adventure.


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Arctic -40

6 lb., 3 oz. • 2.815 kg

14° to -36°F
-10° to -38°C
  • Omnitherm® synthetic insulation
  • Shingled baffle construction
  • Mummy bag with snorkel hood
  • Fleece-lined toe box
  • Draft tube on main zipper & collar
  • Internal key pocket

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Yeti -40

3 lb., 1 oz. • 1.4 kg

10° to -40°F
-12° to -40°C
  • 650+ fill power goose down insulation
  • Mummy bag with snorkel hood
  • Thick, rectangular baffles
  • Lots of leg room
  • Draft tube on main zipper & collar
  • Lightweight breathable nylon shell with DWR

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Top One SL

5 lb., 5 oz. • 2.4 kg

0° to -60°F
-18° to -53°C
  • 850+ fill power goose down insulation
  • Mummy bag with snorkel hood
  • Thick, trapezoidal baffles
  • Fleece lined toe box
  • Draft tube on main zipper & collar
  • Dual-slider zippers on both sides

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TEMPERATURE RATINGS

Our sleeping bags are tested to the European Norm #13537. Our temperature ratings are based on those tests.

  • Tmax: the highest temperature a man can sleep in without excessive sweating with the bag unzipped, hood open, and arms outside the bag.

  • Tcomfort: the lowest temperature an average woman would have a comfortable nights sleep with bag zipped up and hood closed.

  • Tlimit: the lowest temperature the average man would sleep warm in a curled position.

  • Textreme: the lowest temperature the average woman would not get hypothermia in, but frostbite might be possible.

When chosing a temperature range, remember it is easier to deal with temps too high than too low, so aim for the lowest temperature you expect to need the bag for. You can always add a layer or two for extra warmth in the cold, and when it's too warm, it's easy to open up. In winter conditions the insulating value of a high quality sleeping mat underneath will dramatically affect how warm you will sleep. Temperature ratings are based on a dummy representing the “average” man or woman. If you know you tend to sleep warm or cold, adjust accordingly. At altitude you will have reduced circulation, so go with a bag rated for colder temperatures as your destination increases above 3000m (10,000 ft).

Shape

Red Fox offers two basic sleeping bag shapes: semi-rectangular and mummy style.

Mummy bags are form fitting bags, narrower around the legs, wide for the torso with a hood that can cinch tight around the head. This construction minimizes weight without sacrificing warmth.

Semi-rectangular bags are built to the same width for their entire length. Our SR bags have zippers along the length and bottom. They can be fully unzipped and opened up to work like a comforter for two over a bed or our Joint Venture sleeping mat system.

Insulation: Down vs Synthetic

Down: We use high quality white and gray goose down harvested and sorted in accordance with modern international standards. Our sources for down extend around the globe but are predominantly in Asia and eastern Europe. We find our down with an eye toward sustainability, afterall, the birds that provide the down are grown, not manufactured from raw materials. No live plucking. Then it gets washed, sterilized and treated to be waterproof. It still won’t survive a dunking, but it will keep the quills from absorbing water vapor and dry faster if it gets saturated.

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After that it is sorted, with the lightest, airiest stuff getting a high power fill rating. The rating is a measure of how lofty the down is, how well it expands and maintains that expanded volume. Down with a high fill power can save weight on the amount of down used to fill a space. However, the insulating value is dominated more by the thickness of the insulating space, rather than the fill power of the down. When looking at down, remember that quilted means it is good for moderately cold. When temps get sub-zero (-20 C), you want baffled construction, with thicker always being warmer, no matter what the fill power rating is.

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Synthetic: There are two compelling reasons for going with a synthetic insulation. First, it is inherently hydrophobic so it can't and won't absorb moisture. It doesn't have the same loft as down, but it will hold what it does have better in damp conditions. For the same insulating value, synthetic is heavier than down. The second reason for synthetic over down is cost. It may not be as light, or have a comfort range as wide as down, but it won't wet out or cost as much either.  

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