- Features
- Filled and Finished in Santa Rosa, California
- Certified 850+ Fill Power Goose Down - The Best Weight to Warmth Down in the Market; Independently Tested and Certified by International Down and Feather Laboratory in Salt Lake City, Utah. Retested at Fill Time in Santa Rosa to Ensure 850+ Fill Power Every Time. If the Down Does Not Meet Our In-House Test, We Send It Back
- EN Tested
- Pertex© Microlight® Shell and Lining Fabric
- Full baffle construction
- Nautilus 6-Baffle Hood - 6 Chambers of Down Around Head for Better Down Control and Fit, Hood Cord is Positioned for Easy Access
- Classic Trapezoidal Foot Box - For More Foot Room
- Insulated Draft Tube - Eliminates Cold Leaks Through the Zipper
- Full Length Zipper
- Stretch Tricot Baffles - Provide Ultimate Strength, Durability and Bag Life
- Zipper Garage
- Hood Draw Cord - Positioned for Easy Access
- Velcro®-free Face Muff - Keeps the Drawcord and Zipper Away from Your Face
- Stuff and Storage Sack Included - Store and Pack Just Like Your Sleeping Bag
- Zipper Guards - Help Repel Biting Zipper Coils
- Linked Styles
- Style Name:Hydrogen Long
- Style Number:2063
- Weight:1 lbs 12 oz / 794 g
- Fill weight:13 oz / 369 g
- Price:$369.00
- Style Name:
- Specs
- Colors:
- Hemlock (4484)
- Overall Weight:1 lbs 8.77 oz / 702 g
- Fill Weight:11 oz / 312 g
- Size on Hip:58in/145cm
- Size on Foot:40in/99cm
- Main Material:20 Denier 100% Nylon Mini Ripstop DWR 1.1 oz/yd
- Lining Material:20 Denier 100% Recycled Polyester Mini Ripstop DWR 1.0 oz/yd
- Insulation Material:850+ Fill Power Goose Down
- 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.
850 Fill Down
Certified 850+ Fill Goose Down bags are constructed with the following features:
- Nautilus Hood: the same construction as our 8000m jacket hood, a 3D hood that wraps around your head and reduces heat loss.
- Hood Muff: creates a warm down gasket around your face, keeping the drawcord away from the face.
- Stretch Tricot Baffles: allow the bag to be stuffed and unstuffed without tearing the baffle material.
- Trapezoid Foot box: matches the shape of your feet, wider in the toe area and narrower in the heels.
- Down Fill Oversized Draft Tube: eliminates cold spots
- Zipper guard: keeps the draft tube fabric from getting caught in the zipper
- Ground Level Seams: top layer wraps fully around the body creating a warm layer of down.
Down
From the beginning, down has been Marmot’s foremost insulator. No synthetic surpasses the lightweight, compactability and longevity of down.
Marmot Down DNA:
Down is in our DNA. Marmot was founded in 1974 as a manufacturer and seller of premium quality down jackets, vests and sleeping bags. To this day we only use the finest quality certified goose down for our down insulated outdoor products. Mountaineers and outdoor enthusiasts worldwide rely on Marmot down gear for warmth, comfort, and sometimes survival.
Marmot Down Quality:
Down quality is determined by fill power and durability which is dependent upon the age/maturity of the bird and the processing of the down. The best down comes from larger, more mature birds and goose down is better than duck down (when age/maturity are equal). More mature goose down has larger filament clusters than less mature goose down. These clusters, when grouped, provide many more trapped air pockets and therefore provide better insulation. To maximize the effectiveness of the down clusters, the proper processing of the down (sorting, washing & drying) is required to open them up.
Higher fill power means higher loft, better insulation, lighter weight, and greater durability. We test all of our down for content, cleanliness, species, and fill power. We guarantee minimum fill power for all of our down clothing and sleeping bags. That means, for example, that our 800 fill sleeping bags are guaranteed to have at minimum 800 fill power. We don’t believe in + or – variation when it comes to comfort.
Down Origins:
Down is the light, fluffy undercoating at the base of the feathers of waterfowl. Down is a multi-dimensional structure that insulates by creating pockets of still air that retain body heat. Down is highly breathable and exceptionally comfortable. Pound for pound, high quality down is the most efficient natural insulator there is.
Geese are raised primarily for food and the down that is derived from them is a by-product of the food industry. Geese are raised on large and small farms and roam free outside on these farms. This is their natural environment. They are not raised indoors in controlled conditions. Geese are grain fed and also have access to local plant life.
Geese are generally harvested after 4-9 months for food. Some female geese are kept for breeding stock and are harvested between 1-2 years. These are the geese called the “mother birds” that provide the best, most mature down. After the geese have been harvested for food, the down and feathers are removed, washed, dried and then sorted by separating the down and small feathers from the larger, heavier feathers. These processing methods determine the final quality and fill power of the down. Marmot currently buys down primarily from Russia, Poland & China.
Marmot Guaranteed For Life:
Since 1974 we’ve guaranteed every product we’ve made for the life of the product. We believe the best thing for everyone and the environment is to make products that last.
Have a closer look - download the Marmot down desktop and keep your computer warm.
EN Tested
How do I read the EN information?
Basically the EN graphic shows a temperature range:
| Comfort Limit | The first number is based on a standard woman having a comfortable nights sleep |
| Lower Limit | The next number is based on a standard man at the lowest temp to have a comfortable nights sleep |
| Extreme Rating | The last number is a survival rating for a standard woman |
For example, the rating on our Pinnacle 15º Sleeping Bag shows:
| Comfort Limit | 22.2 degrees |
| Lower Limit | 10 degrees |
| Extreme Rating | Minus 24.7 degrees |
In this example, if a woman who sleeps cold is planning a trip with expected lows between 15 and 25 degrees, she could definitely use the Pinnacle 15 bag. But she may instead consider buying a zero degree bag to sleep more comfortably at the lower temperatures.
Testing Center
Marmot began as a sleeping bag company and we continue to pioneer performance, value and insulation standards in the outdoor industry. All Marmot sleeping bags are EN tested to ensure quality and performance. During the development process, we send all samples to the Thelma Testing Center in Norway. We continually use the Thelma Center to achieve continuity in our results.
What is the EN 13537 test? EN, short for European Norm, is a government test for sleeping bags.
How is the EN test conducted? First let’s be clear that it is challenging to test temp ratings because there are so many variables. Every person will sleep differently in the same bag. Choices like clothing, sleeping pad, tent or no tent, eating and drinking before bed can all affect one’s sleeping experience. For the EN test, a copper mannequin named Charlie is fitted with 20 sensors and a clothing layer (top, bottom, and socks) that provide a consistent thermal value. The mannequin is placed in the sleeping bag and put onto a wood platform roughly 12mm thick. The board is held above the floor with some support which allows air circulation under the board. The board is covered with a mattress that has a consistent thermal value then placed in a cold room. A mathematical formula is used to measure the data received from the sensors based on human modeling.
Why is there an EN Test hangtag on Marmot bags? Marmot sleeping bags sold in Europe require this testing and hangtag. We include this hangtag on all of our bags, as we believe it is the most reliable and accurate measure of the performance of a sleeping bag currently available.
How does EN testing differ from other methods and is it better? When Marmot first started testing bags, especially when we used Gore-Tex® fabric, our designers would go into meat lockers and sleep over night. Once they were able to sleep through the night they looked at the amount of fill to determine the temp range. Nowadays it is a bit more scientific. The testing method used in the US is very similar to the EN test. They use a copper mannequin, but the clothing, pad, and math formula are different. Again we feel the EN test is the most reliable and accurate measure of the performance of a sleeping bag currently available.
Has the feedback from the EN testing improved the designs of Marmot bags? Yes it has. The vast majority of our bags have tested to our current temp ratings. In some cases, the tests showed our bags were actually warmer than the rating we gave it. In another instance, there was a spot that showed room for improvement which led to more efficient baffle construction. With our baseline testing started in 2004, we can now measure improvement over time through new fabrics, insulation, and construction techniques.
Will the EN test become an industry wide standard? That is unknown. Currently our industry can’t agree on how the testing should be done because of all the variables. The European government has stepped in and taken control of standardized testing. For the meantime, Marmot will continue to test with the EN standard.
Marmot rating vs. EN rating?
Marmot’s assigned temperatures are comparable
to the EN lower limit rating.
During Marmot’s development process we send
all samples to the Thelma Testing Center in Norway.
Continually using the Thelma Center allows us to achieve continuity in our results.
Outside 5/09 Hydrogen
Ultralight Backpacking
Because it’s stuffed with ultra-compressible (and lofty) 850-fill down, Marmot’s 30-degree Hydrogen packs smaller than a loaf of bread and weighs less than 1.5 pounds.
UKClimbing.com 7/31/08 Hydrogen
Is the Marmot Hydrogen any Good? YES!
It fits our needs; the temperature range is right and we want a Down bag not a Synthetic one. So is the Hydrogen a good choice? YES!
I’ve used the Hydrogen bag camping in the UK, sleeping in my van with Mick Ryan on very important business meetings for UKC, on a camping trip to Europe and an extended trip big walling in Madagascar. The shell is made from ‘LightForce N-120R DWR’ (whatever that means) and is tough and extremely light. I’ve slept in prickly Madagascan bushes and the fabric has stayed intact. The inner fabric is very similar, but perhaps a little softer on the skin. Again I have had no problems after several months of hard use.
We have already established that Marmot has used exceptional quality Down in this sleeping bag and it has stayed lofted and ‘puffy’ even after repeated cramming in to a stuff-sack. I haven’t had to wash the sleeping bag at all (washing correctly can help re-loft old bags). The zip is a high quality YKK zip, which has worked perfectly and felt sturdy. The fabric of the zip baffle has occasionally got stuck in the zip, but is more than tough enough to cope with being trapped and has always easily come out unscathed. Marmot has added a ‘Zipper Guard’ to stop the zip from snagging – this is a stiffened section of fabric behind the zip. It did work to a degree, but as with all sleeping bags, they do get snagged occasionally.
The shape of the bag is well thought out. The hood design is pretty much perfect and covers the head snugly, trapping in warmth. The baffle is great – well designed with no Velcro or other rough materials that might irritate your face during sleep. Equally the zip hides away under the baffle nicely and doesn’t rub your chin. The foot box is shaped ergonomically too, meaning your feet have enough room (even my size 10 boats).
The draw-strings are in the right places, easy to reach and work well. The colour, well, it’s kind of a shiny green. I think it looks quite smart, but you’ll have to make your own mind up.
Weight: According to my trusty Tesco kitchen scales the Hydrogen comes in at a tiny 712g, which is the same as 2 apples and a banana. Not bad!
Conclusion: A super-light summer Alpine or UK bag, with all features you need, none that you don’t. Well made from the finest materials with great, simple design. If you are looking for a down sleeping bag for bivvying in the Alps, general UK climbing/camping use, lightweight backpacking, etc., then this would be a good choice. If you’re looking for a winter Alpine bag or something for bigger mountains further afield, then look for something a bit meatier.
- Jack Geldard, Editor
Outdoor Life 5/1/09 Hydrogen
The Light Stuff
The Hydrogen sleeping bag from Marmot weighs only 1 pound, and can be scrunched down to nearly nothing. Need we say more?
Outdoor Life 5/09 Hydrogen
The Light Stuff
Ultra-Light Bag: The Hydrogen sleeping bag from Marmot weighs only 1 pound, and can be scrunched down to nearly nothing. Need we say more?
Chevy Outdoors Sporting Journal Gear Guide 10/08 Hydrogen Ultralight Sleeping Bag
Cool-Weather Excursion Essentials
There’s not much better than a good night’s sleep after a long day in the wilderness. This down sleeping bag features a breathable, water-resistant shell that helps keep you warm in frigid temperatures and prevents you from getting steamy in warmer weather. Weighing less than two pounds, it’s light enough to carry on a caving or hiking adventure but comfortable enough that you might not even miss your own bed.
Backpacker 4/08 Ultralight Bags
Editors’ Choice Gold Award
Marmot Ultralight Down Bags
Sleep-anywhere evidence that luxury and lightweight can go hand in hand.
Want to see a down bag puff up like a hot-air balloon? Unfurl one of these 850-fill sacks and stand back. Each bag in this line is overstuffed with the highest quality feathers we’ve seen – light, compressible, and amazingly lofty. And the down is well distributed throughout – with enough on the bottom to keep your back from chilling if you roll over. The no-skimp approach to down has made these bags a tester favorite since 2001. Add Pertex Quantum shell fabric – which is breathable, wispy, water-resistant, and durable – and simple designs that are comfortable but thermally efficient, and you get standard-setting bags. If you require separate pockets for your iPod, make-up kit, and dental whitening strips, or other doodads like foot vents and pad straps, these elegant sacks are not for you. But what features there are we love: A muff around the face seals well without forcing you to crank down the drawstrings; the footbox is roomy enough for booties and hot-water bottles; and zippers stay zipped without relying on scratchy Velcro. Plus, there’s a version for virtually every trip.
Adventura Spring 2009 Hydrogen
Sweet Dreams
Marmot’s Ultralight sleeping bags are heavyweights when it comes to quality. You’ve got it all with non-tear nylon, 850-plus down, and a breathable, waterproof shell. You’ll sleep like a baby! – Louis St-Jean
Backpacker Editor's Choice Gold Award
Marmot’s Ultralight Series Sleeping Bags Named Backpacker 2008 Editor’s Choice Gold Award Winner.
Marmot’s Ultra-light Sleeping Bag Series & DriClime® Catalyst Windshirt Named Backpacker 2008 Editor’s Choice Award Winners
Santa Rosa, CA – Marmot’s Ultra-light, Down Sleeping Bags and Marmot’s DriClime® Catalyst Windshirt have been honored as recipients of the 2008 Backpacker Magazine Editors’ Choice Award, one of the most prestigious awards in the outdoor industry. The award is given in recognition of outstanding innovation in product design, materials and/or performance.
The Backpacker Editors’ Choice Awards, given annually since 1993, honor the products that Backpacker editors have chosen as the best of the year based on months of trail testing by teams of highly experienced hikers and climbers. With no set categories for the awards and no set number of recipients, the products and the testing process drive the award categories. Marmot was two of only 17 innovative products that have been honored with a 2008 Backpacker Editors’ Choice Award.
Marmot’s Ultra-light 850 Fill bags, which include the Atom (40ºF); Hydrogen (30ºF); Helium (15ºF); Helium EQ (15ºF) and Lithium (0ºF), have all received Backpacker’s Editor’s Choice “Gold Award” for their time-tested excellence in the field. “These ultra-light 850 Fill bags are the perfect example of Marmot’s ongoing commitment to produce the highest quality gear,” explains Jeff Blakely, Director and Category Manager of Equipment. “This award celebrates Marmot’s leadership, tradition and heritage.”
Marmot’s DriClime® Catalyst Windshirt – a versatile, athletic, wind and water resistant jacket – has received Backpacker’s Editor’s Choice “Green Award” this year. “This is an honor for our whole product team,” explains Greg Houser, Marmot’s Vice President of Design and Production. As the next step in the Marmot’s DriClime® evolution, the Catalyst uses UpCycle™ fabric in the bi-component lining (100%) and a recycled polyester face fabric (88%) with an additional Eco DWR. It also has a completely recycled zipper. “The Catalyst has set a new precedent for Marmot and shows us what is possible when using Marmot’s UpCycle™ technologies in our products,” adds Houser.
The Original DriClime® Windshirt won Backpacker’s Editor’s Choice Award in 1993 and then in 2002 it won the Editor’s Choice “Gold Award,” which recognized the garment as an industry standard. By winning this year’s “Green Award,” Marmot is the first company to capture Backpacker’s “Triple Crown” – honoring the garment separately three times!
Check out the Marmot Ultralight Sleeping Bag Collection.
Curly's Clips - Caring for Marmot Sleeping Bags
Marmot's own Curly Cervone and Brian Rashap demonstrate how to properly care for you Marmot sleeping bag.
Curly's Clips - EN Testing
Marmot's own Curly Cervone and Randy Verniers explain EN Testing on sleeping bags and how it can help you as you shop for the perfect bag in this edition of Curly's Clips.
Curly's Clips - Marmot Down
Marmot's own Curly Cervone and Randy Verniers explain why Marmot Down is the best on the market.
Curly's Clips - Marmot Hand Crafted Sleeping Bags
Marmot's own Curly Cervone takes you into the Down Room at Marmot Headquarters in Santa Rosa, CA, where our 850+ fill sleeping bags are filled, sewn, and hand crafted right in our offices.
Curly's Clips - Marmot Down vs Synthetic Insulation
Marmot's own Curly Cervone and Randy Verniers discuss the differences between down and synthetic insulation, explaining how each works and identifying when you may want to choose one over the other.
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 2/17/10.
There are no long sleeping bags listed!! Please don't tell me that Marmot stopped selling them. These are the best bags made, so please don't tell me that I have to switch to a new brand! I'm scared.
on 2/18/10.
I see them now. they listed them together. my bad, I was really scared!
on 5/16/10.
What means full baffle construction? It´s that you can shift the down from top to bottom as you like?
9
on 6/23/10.
Baffle construction means the horizontal compartments built into the sleeping bag which hold the down in place.
on 9/11/10.
I have the older black version. This is the best bag I have owned. Not sure why Marmot left the basic black color--it dries quickest in the sun. I use the bag as a quilt with my feet in the pocket and the open zipper on left and right sides with a Big Agnes Primaloft Air Core pad. This is a good system. The bag will go to lower temperatures than rated.
on 10/12/10.
The Hydrogen is a great bag! I’ve owned it for over a year now, and used it on more than a dozen trips. Many times at or below freezing temperatures. I usually sleep cool, but this bag keeps me toasty and warm all night and through the 4 AM chill hour. It’s so light at 28 oz. I bring it along on day hikes and snowshoe trips, just in case. On the spendy side for a sleeping bag, but with Marmot, you get what you pay for. Thank you Marmot for such a great sleeping bag!
on 2/19/11.
I've had my Black Hydrogen for 3 yrs now...LUV it. Many nights in Sierra's and deserts. It's fine for me into the 20's, and with my silk cacoon, I can be comfy even lower and keep bag clean. Lt, comfortable, and Marmot.
on 3/29/11.
love this bag got the black one about 6 years ago. still awesome. slept a winter in nyc loft with no heat and no blankets just this. fantastic and durable, and warm. long is perfect for 6' 4" anymore might be iffy, love the half zipper.
if they made a jacket out of this material and fill with a half zip id buy that too. very comfortable
on 4/7/11.
How Tight can you compress this sleeping bag, Dimension wise? My bag now compresses to 7"x11"
on 6/4/12.
6x12in is the listed stuff sack size.
on 5/3/11.
I just used this bag on a 500 mile section on the Appalachian trail. This bag kept me warm during many nights in the teens and 20's. I sleep very warm so I always woke up a little sweaty. Very comfy and packs down very small. Overall I rate this bag a solid nine. Great job marmot, I was very pleased with my purchase. Looking for a lightweight summer bag now to use in the whites.
on 6/20/11.
Love the bag, does as advertised, and is another testament to Marmot's high quality. This is the second Marmot bag that I own and don't regret it one bit. I do like a little extra water protection with the stuff sack and I find the 6 liter Sea to Summit Ultra Sil compression bag works perfect for the Hydrogen. I also use the same compression sack for my Marmot Mountain Down jacket.
on 6/23/11.
Like others before, I have the older 900 fill black model of this bag and it has been a wonder for over six years now. Not as waterproof as is my Helium EQ and my Lithium Membrane. I'm comfortable in this bag to temperatures around 30 degrees inside a Hilleberg Akto tent. Below that temperature I've got to add some extra clothing, socks. I've used it approximately 30 nights and it still seems to be as good as the day I bought it, in other words pretty durable for such a light weight bag. I also have a 900 fill Atom but that one is a tad small, and not nearly as warm for only a few ounces less weight. The Hydrogen in any incarnation is an excellent summer sleeping bag which I would recommend highly to anyone contemplating a purchase.
on 9/4/11.
AGAIN, I'm interested in the Hydrogen sleep bag. Dimensions are important to me, and website lists hip and foot girth. But what about SHOULDER girth? This is important to me. Not to Marmot? Consequently retailer's websites lack this important piece of info as well.
on 6/4/12.
62in, or 157.5cm
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