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Western Mountaineering Antelope MF Review

If you're looking to shave weight and stay warm when temps are hovering around 0º, check out the Antelope
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western mountaineering antelope mf sleeping bag cold weather review
Western Mountaineering Antelope MF
Credit: Western Mountaineering
Price:  $740 List
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Manufacturer:   Western Mountaineering
By Matt Bento ⋅ Review Editor  ⋅  Apr 14, 2017
67
OVERALL
SCORE


RANKED
#7 of 13
  • Warmth - 20% 6.0
  • Weight - 20% 8.0
  • Comfort - 20% 6.0
  • Packed Size - 15% 7.0
  • Weather Resistance - 15% 7.0
  • Features - 10% 6.0

Our Verdict

The Western Mountaineering Antelope MF is a stellar, high-performance five-degree sleeping bag. The down is the best available, 850-fill, and the shell material, MicroLite XP, is strong and highly water resistant for its weight. Weighing in at 2lbs 10oz, this bag presents a great warmth-to-weight ratio and loft for days. Attention to detail and bombproof construction make this a bag fit for years of adventure. Continuous baffles allow you to move the down from the top to the bottom of the bag, thereby making it a true year-round performer (move the majority to the top for winter and to the bottom for summer).
REASONS TO BUY
Warm
Incredibly light
REASONS TO AVOID
Weak neck baffle Velcro
Shallow hood

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Overall Score Sort Icon
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62
Star Rating
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Bottom Line This lofty, lightweight bag has an excellent warmth-to-weight ratioThis bag is the cream of the crop when it comes to loft and comfortThis lightweight sleeping bag comfortably cradles you with warm, lofty downExcellent for moving in the mountains in cold weather, this model is lightweight, packs small, and stays true to its temperature ratingThis budget bag offers protection from the elements via a large draft tube and plush draft collar
Rating Categories Western Mountaineer... Western Mountaineer... The North Face Infe... Mountain Hardwear P... Mountain Hardwear B...
Warmth (20%)
6.0
8.0
8.0
8.1
7.0
Weight (20%)
8.0
7.0
8.0
8.0
6.0
Comfort (20%)
6.0
8.5
7.0
6.0
6.0
Packed Size (15%)
7.0
7.5
6.0
8.0
5.0
Weather Resistance (15%)
7.0
7.0
9.0
6.0
7.0
Features (10%)
6.0
7.0
6.0
8.0
6.0
Specs Western Mountaineer... Western Mountaineer... The North Face Infe... Mountain Hardwear P... Mountain Hardwear B...
Measured Weight (size Regular) 2.63 lbs 2.85 lbs 2.68 lbs 2.68 lbs 3.13 lbs
Fill Weight 26.0 oz 30.0 oz 29 oz 29.6 oz 35.0 oz
Type of Down Fill Goose Down Goose Down Down RDS Certified Goose Down RDS Cert/Fluorine Free Down
Fill Power 850 850 800 850 650
Material Weight (excludes down filling) 16.0 oz 15.7 oz 13.9 oz 13.3 oz 15.1 oz
Temperature Rating 5°F 0°F 0°F 0°F 0°F
Pocket No No No Yes Yes
Shoulder Girth 62" 66" 64" 58" 62"
Hip Girth 53" 57" 60" 52" 53"
Foot Girth 39" 41" 44" Not listed Not listed
Shell Material 20 Denier Microlite XP MicroLite XP 15D recycled nylon, 30D nylon taffeta 10D Nylon Ghost ripstop, DWR finish 20-Denier ripstop nylon
Continuous Baffle Yes Yes Not listed No Yes

Our Analysis and Test Results

We love the Western Mountaineering bags for their incredible craftsmanship and attention to detail, and the Antelope MF is no exception. It has the snag-free zipper that makes our testers smile, and a warm hood and draft collar that keeps out the cold better than the Nemo Sonic or the REI Magma 10. This bag is expensive, but you get what you pay for: The highest quality down feathers and a bag made in the USA.

Performance Comparison


western mountaineering antelope mf sleeping bag cold weather review - we were blown away by the loft of the antelope every time we...
We were blown away by the loft of the Antelope every time we unpacked it.
Credit: Matt Bento

Warmth


The Antelope MF is loaded with 26oz of 850 fill power high-quality goose down. Right out of the box our testers were impressed with its towering loft. On nights dipping into the low teens, testers found this bag warmer than the heavier Kelty Cosmic Down, Rab Ascent 900, the Nemo Sonic, and the Antelope's lightweight brother, the Western Mountaineering Versalite. Our discerning, hair-splitting testers deemed the Feathered Friends SnowBunting to be slightly warmer. The Marmot Col, and The North Face Inferno are all significantly warmer than the Antelope, but also significantly heavier.

Weight


At 42oz, the Antelope excels in the weight race. It is impressively lightweight, edging out the similarly rated Rab Neutrino 800, and the Nemo Sonic, while blowing its less expensive competitors like the Kelty Cosmic Down and the Rab Ascent 900 out of the water. It achieves this with high-quality down, a narrow cut, and lightweight MicroLite XP shell fabric. This makes the Antelope a good choice for long ski tours, three season backpacking, and summertime alpine endeavors.

western mountaineering antelope mf sleeping bag cold weather review - here our tester is happy to have 6" of loft between him and the...
Here our tester is happy to have 6" of loft between him and the rain, but he is not happy that it's 35 degrees and raining.
Credit: Matt Bento

Comfort


If you are primarily a back sleeper, the Antelope will provide many comfortable nights of slumber. The substantial draft collar sits snugly under our testers' chins, and the shallow hood cinches down until only our noses stick out. For side and belly sleepers, the Antelope's shallow hood is less than optimal. The bags that received our highest comfort ratings like the Marmot Col feature larger hoods that stay suspended over your head, maintaining an airway and ventilation, even when you burrow down in the bag. This makes for a more comfortable side sleeping position. Our testers found it difficult to sleep comfortably on their sides in the Antelope due to the shallow hood.

western mountaineering antelope mf sleeping bag cold weather review - a high-quality, durable stuff sack is included with the antelope. we...
A high-quality, durable stuff sack is included with the Antelope. We got it to pack down even smaller in our compression sack.
Credit: Jenni Snead

Packed Size


Western Mountaineering states that the packed size of the Antelope is 8"x 17". Our hands-on testing confirmed our suspicions that the Antelope would be extremely compressible. Among its similarly weighted competitors, it just barely packs smaller than the Feathered Friends Snowbunting, but not quite as small as the Nemo Sonic. It compresses much better than the Kelty Cosmic Down 0, and packs down smaller than super warm heavyweights like The North Face Inferno and the Marmot Col.

western mountaineering antelope mf sleeping bag cold weather review - the antelope isn't as compact as its lighter the cousin, the western...
The Antelope isn't as compact as its lighter the cousin, the Western Mountaineering Versalite, but it still leaves plenty of room in our packs for other winter gear.
Credit: Matt Bento

Features


The Antelope is stripped down so you can go light and fast. It doesn't include any zippered pockets or reinforced foot boxes. What it does have is far and away the best zipper of any of the sleeping bags we tested. Our testers loved the snag free ease of getting in and out of this bag. We found that we could get out of the bag quickly and easily in the dark of night without getting the zipper caught. Western Mountaineering has nailed it. No other zipper comes close. An inch of stiff tape is sewn next to the zipper on both sides, preventing the draft tube and tiny folds in the fabric from getting caught.

The draft tube is stuffed full of down and hangs down from the top of the bag, eliminating cold spots. Our testers were impressed that such a beefy draft tube didn't ever get stuck in the zipper. We can't say enough how much we loved this zipper. The draft collar is also one of the most substantial collars in this review and does an excellent job of keeping out the cold air when you are sleeping on your back. The 850 fill goose down doesn't boast a hydrophobic treatment like the Rab Ascent 900 or the Big Agnes Crosho -20, but the high-quality shell fabric worked so well at keeping out moisture, we don't feel this detracts from the features rating at all.

The Antelope comes with a huge storage sack. This allowed us to store the bag at almost its maximum loft, which increases the longevity of the bag.

western mountaineering antelope mf sleeping bag cold weather review - all that down in the hood and draft collar kept our noggins toasty...
All that down in the hood and draft collar kept our noggins toasty, while the black interior dries quickly in the sun.
Credit: Matt Bento

Weather Resistance


This contender performed well in our light rain test, keeping our tester completely dry even as water puddled up on the shell. No moisture could be felt along the zipper thanks to the beefy draft tube. In our submersion test, the MicroLite XP shell fabric proved to be truly waterproof and breathable as we squeezed out the air and bag remained compressed, absorbing no detectable moisture. While these tests are beyond what a user would typically encounter when temperatures are well below freezing, they show that the Antelope is impervious to condensation or small amounts of melting snow. The all-black interior of the Antelope greatly aided in the drying time, and we found that this bag was fully dry, lofted and ready to go after three hours drying in the sun.

western mountaineering antelope mf sleeping bag cold weather review - the microfiber shell fabric effectively keeps water on the outside...
The Microfiber shell fabric effectively keeps water on the outside of the bag, while our testers stayed warm and dry inside.
Credit: Matt Bento

Other top scorers in the weather resistance category include the Western Mountaineering Kodiak MF, Marmot Col -20, Feathered Friends Snowbunting, and The North Face Inferno -20, securing their position for the top contenders for weather resistance.

Best Application


Cold weather backpacking, ski touring, and any activity where you're looking to maximize the warmth to weight ratio are when this bag weighs supreme. Check out the Rab Ascent 900 for a warm but much heavier budget-friendly bag.

Value


At $625 for a size 5'6, the Antelope is a major investment for sure, but its high-quality materials make it a great choice for three-season camping when temperatures are hovering in the teens. When stored properly in its included giant storage bag, it should last for decades. Check out our Buying Advice article to learn how you can make this bag go further based on your individual sleeping style.

Conclusion


The Western Mountaineering Antelope MF is an excellent choice for those looking to shave weight for fast and light adventures. Its high-quality construction and materials are extremely weather resistant, and it has an incredible warmth to weight ratio.

Matt Bento