- Features
- Marmot MemBrain® Waterproof/Breathable Fabric - Marmot MemBrain, Waterproof/Breathable Fabric
- Fully Seam Taped
- Highly Compressible
- Storm Flap
- Specs
- Colors:
- Alert (9321)
- Maximum Weight:15 oz / 0.4 kg
- Minimum Weight:14 oz / 0.4 kg
- Dimensions:8x36x86in / 20x91x218cm
- Packed Size:6 x 9 in / 15 x 23 cm
- Tent floor Material:40d 100% Nylon Ripstop 3000mm W/R, F/R
- Tent canopy Material:MemBrain®Strata™ 100% Nylon Ripstop 2.2 oz/yd
- Colors:
Marmot Tech Manual
If you are a tech geek and want to know everything about our current technologies, click here to download our tech manual.
MemBrain® Strata™
Marmot’s own lightweight waterproof / breathable technology. A lamination technology that rates a whopping 20,000mm in waterproof performance and 20,000 gr in breathability.
Requiring neither lining nor 3-layer construction like many similar lamination processes, MemBrain® Strata™ products are by far the lightest, most breathable garments in their categories.
Marmot’s proprietary 2.5 layer MemBrain® Strata uses micro non-organic particles on the inside of the lamination to increase durability and provide a dry touch instead of that clammy feeling you get from some other products.
The back print pattern is carefully designed to achieve the maximum durability and breathability. Abrasion tests rate 4-5 times better than regular MemBrain® (which is why regular MemBrain, as well as all 2-layer laminates require a separate lining).
Compared to 2.5 layer coatings in the market, our 2.5 layer lamination is about 100% more breathable. In addition, laminated stretch fabrics stretch more and have a softer hand than 2.5 layer coated fabrics.
Backcountry October 2009 Alpinist Bivy
For Backup Protection on solo missions, and for traveling as light as possible, Marmot’s Alpinist Bivy is breathable and waterproof insurance against wind, snow, and rain. It packs up small, weighs less than a pound, and while a tent offers more comfort for sleep, this bivouac will keep the weight off your feet. This is a minimalist, form-fitting shelter – not for the claustrophobic.
Tonya and Brad Clement review the Alpinist Bivy
Tonya and Brad Clement, while climbing Andrews Glacier Gorge in Rocky Mountain National Park, CO, review the Marmot Alpinist Bivy.
Size Chart
| 4'11"-5'2" | 5'2"-5'6" | 5'6"-5'10" | 5'10"-6'2" | 6'2"-6'6" | |
| 90-110 lbs | XS | S | |||
| 110-135 lbs | XS | S | M | ||
| 135-160 lbs | S-M | M | M-L | ||
| 160-195 lbs | M-L | L | L-XL | ||
| 195-230 lbs | L | L-XL | XL-XXL | ||
| 230-265 lbs | XL-XXL | XXL-XXXL |
Sizing by Body Measurements
| XS | S | M | L | XL | XXL | XXXL | |
| Parkas/Jackets/Sweaters/Tops (Unisex) | |||||||
| Chest | 33-35 | 36-38 | 39-41 | 42-45 | 46-49 | 50-53 | 54-57 |
| Neck | 13.5-14 | 14.5-15 | 15.5-16 | 16.5-17 | 17.5-18 | 18.5-19 | 19.5-20 |
| Sleeve | 30-31 | 32-33 | 34-35 | 35-36 | 36-37 | 37-38 | 37-38 |
| Pants/Bibs (Unisex) | |||||||
| Waist | 26-28 | 28-30 | 31-33 | 34-36 | 37-39 | 40-42 | 44 |
| Hip | 36-38 | 38-40 | 40-42 | 43-45 | 46-48 | 50-52 | 56 |
| Inseam (reg) | 28 | 29.5 | 31 | 32.5 | 33 | 33.5 | 34.5 |
| Inseam (short) | 26 | 27.5 | 29 | 30.5 | 31 | 31.5 | 32.5 |
| Inseam (long) | 30 | 31.5 | 33 | 34.5 | 35 | 35.5 | 36.5 |
| Gloves (Unisex) | |||||||
| Girth | 6.5-7 | 7-7.5 | 8-8.5 | 9-9.5 | 10-10.5 | ||
| Parkas/Jackets/Sweaters/Tops (Women's) | |||||||
| Size | 4-6 | 6-8 | 8-10 | 12-14 | 14-16 | ||
| Bust | 30-32 | 32-34 | 35-37 | 38-40 | 41-43 | ||
| Sleeve | 29-30 | 30-31 | 32-33 | 34-35 | 36-37 | ||
| Pants/Bibs (Women's) | |||||||
| Size | 4-6 | 6-8 | 8-10 | 12-14 | 14-16 | ||
| Waist | 22-24 | 24-26 | 27-29 | 30-32 | 33-35 | ||
| Hip | 33-35 | 35-37 | 38-40 | 41-43 | 44-46 | ||
| Inseam (reg) | 27.5 | 28.5 | 30 | 31.5 | 32 | ||
| Inseam (short) | 25.5 | 26.5 | 28 | 29.5 | 30 | ||
| Inseam (long) | 29.5 | 30.5 | 32 | 33.5 | 34 | ||
| Gloves (Women's) | |||||||
| Girth | 6-6.5 | 6.5-7 | 7.5-8 | 8.5-9 | |||
Kid's Sizing (boys & girls)
| XS | S | M | L | XL | |
| Age | 4-5 | 6-7 | 8-9 | 10-12 | 13-15 |
| Chest | 24-26 | 26-28 | 28-30 | 30-32 | 32-34 |
| Waist | 19-21 | 21-23 | 23-25 | 25-27 | 27-29 |
| Hip | 24-26 | 26-28 | 28-30 | 30-32 | 32-34 |
| Inseam | 17-18 | 19-20 | 21-22 | 23-25 | 26-28 |
| Sleeve | 22-24 | 24-25 | 25-26 | 26-28 | 28-30 |
| Height (in.) | 36-42 | 42-48 | 48-54 | 54-60 | 60-65 |
| Weight (lbs.) | 35-42 | 42-50 | 50-60 | 70-90 | 90-115 |
Garment Sizing Information
The charts above will help you select the proper size.
If you have questions, please call us.
Care Instructions
Marmot does not recommend dry cleaning for any of our products. Gore-Tex® fabric products, MemBrain® fabric products, down insulated products, and fleece are all machine washable. You should use a commercial front loading machine and follow the care instructions.
Reviews and comments
on 3/3/10.
Listen, I was very excited when I looked at the picture. Avoiding the wet with out the tent! Brilliant. But then I saw the video. I was eager to witness a vicious storm of the century type of situation and two insane alpinists throwing down the bag in the midst of rain pouring on their heads or possibly even snow. Please make this video happen.
on 5/14/10.
Totaly agree!! That might as well have been filmed/reviewed in someones bedroom. Im still considering getting one for an attempt at the Cuillin Ridge Traverse, so if I get one I will give a review based on some use in proper Scotish Highland weather :)
on 3/3/10.
I agree, Jason. For a product known as the "Alpinist Bivy" that video was terrible. I hope that the purpose of this bag is not so you can manage to carry brie on camping trip. A proper review would at least show it being used out from under the protective overhang they were hiding beneath. Sheesh.
on 4/6/10.
Hi,
nice video. Wondering about Alpine Ski Touring here in Canada ??? How does the bag compare to Gore Tex bags in terms of allowing water vapor to penetrate through the material ? I need a dry sleeping bag even after three or four nights in the snow.
Harry
on 8/14/10.
Amazing product, i really recommend it to anyone.
on 11/7/10.
I used this bivy on an ascent of the Labyrinth Wall this summer. Easy to stay tied in, totally secure and dry in a storm, easy to keep the vent lined up for good breathing. So glad I had it!
on 12/31/10.
This bag saved 2 lives this winter in NZ Southern Alps. Thanks Marmot.
However, I do have some questions.
After an accident we had to bivvi out unexpectedly.
We had some of the heaviest rain on record (172mm in one night) with the barometer reading 871 at 1000m of altitude. We spent 3 days in these bags. Temperature was around 4 celsius.
We had huge perspiration issues in the bags (only had small breathing holes open however as we were cold).
Bottom line, sleeping bags become saturated and what I'd hoped would be mild discomfort ended up becoming fairly serious.
Do these bags only breathe when there is a significant temperature differential (bit like single skin tents?).
Been using Goretex bags for years without the perspiration issue, but then again these are so much lighter, hence the change.
Can anyone shed any light on this?
on 1/18/11.
My understanding is that vapour transmission occurs by diffusion across ie down the gradient, therefore temp is not important but humidity is. If it is very dry outside the back vapour will pass through to the outside, but if it is very humid outside the gradient is less and moisture will stay in the bag. Additionally if the fabric of the bag itself becomes saturated with water it will no longer work as 'breathable', this is true of any jacket, bivi, boot etc that uses any type of membrane or coating designed to 'breathe' and is why you ahev to recoat the outside periodically with a product designed to make water bead up and run off like when the product is new. If it soaks into the fabric it will not work.
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