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Marmot WarmCube Gallatin 20 Stargazer/Solar Regular

Marmot WarmCube Gallatin 20 Stargazer/Solar Regular


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The WarmCube Gallatin is a warm, packable and innovatively constructed sleeping bag utilising Marmot's cubed baffles and high-quality down insulation.


Season : 2020W R

Code : 36420-1995

Weight : 0KG

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What is the WarmCube Gallatin?

The WarmCube Gallatin is a warm, packable and innovative sleeping bag utilising Marmot's brilliant cubed baffle construction (hence the WarmCube bit!). With a comfort rating of -6°C, it's suitable for four-season use here in the UK and is designed to withstand the typical wet and wild conditions we face in the mountains.

What is it made of?

Insulation: Providing the warmth inside the WarmCube is two different forms of insulation — you've got high-quality 650 fill-power down throughout the majority of the bag with Marmot's own HL-ElixR Micro insulation layered over the top. One of the benefits to layering ElixR over the down is that it's virtually unaffected by moisture, meaning if the bag gets a little damp, the overall warmth of the bag will remain largely the same. Another benefit is ElixR acts as a second barrier against heat escaping if it manages to pass through the down, resulting in a warmer, more efficient bag.

Fabrics: Surrounding the insulation is the well-established and reliable Pertex Quantum. This fabric is highly water-resistant, wind-resistant, tough and now also environmentally-friendly! It's made entirely of recycled polyester, yet still performs exactly the same as standard Quantum. A ripstop weave prevents the whole bag spilling open if you happen to get the fabric caught or snagged.

How is it constructed?

It isn't so much the insulation that's the impressive bit, though, it's the way it's distributed around the bag. You may have guessed by the title of the bag that it features lots of warm cubes! Marmot have placed the down into tonnes of cubes throughout the chest and footbox — these cubes sit snugly next to one another in a sort of 'sleeping bag igloo', trapping more warmth with virtually no negative effects. A traditional baffled construction is placed over the legs, where you require less warmth, and then the synthetic insulation is layered over the whole lot.

An anatomically-shaped footbox lets your feet sit upright in their natural position without compressing the cubes, resulting in a warmer and more comfortable bag.

What are its features?

A two-way locking zip allows you to ventilate by opening up just the lower, just the upper, part of the middle... you get the idea. The 'lockable' bit prevents the zip coming undone in the night and allowing all of your precious heat to escape in freezing conditions. A draft tube (an insulated zip baffle) prevents heat escaping through the zip itself, while a snug hood with a drawcord seals around your face for additional warmth. An internal stash pocket provides the perfect place for your phone to prevent its battery draining in cold conditions.

How does it fit?

The WarmCube features Marmot's 'mummy' fit with a regular length. This fit perfectly balances comfort and performance; too baggy and it'll take ages to warm up, too snug and it'll be uncomfortable when wearing layers. The mummy fit also allows you to wear extra layers inside the bag to boost warmth.
  • 650FP down insulation
  • WarmCube construction
  • ElixR synthetic insulation layered over the top
  • Pertex Quantum main fabric
  • Anatomically shaped footbox
  • Internal stash pocket
  • Hood drawcord
  • Two-way zip with draft tube
  • Recycled outer fabrics
Care & Advice

How warm a sleeping bag do you really need? We’ve tried to help you by grouping our sleeping bags by their recognised comfort ratings. These are the ratings supplied by the brands that indicate the temperature at which you will remain comfortable whilst sleeping on a good insulated sleep mat. After all, comfortable is what you want to be when it’s cold and wet outside and you’re all tucked up in your nice warm sleeping bag.

We always recommend that you choose your bag according to the coldest conditions you will experience; you can always unzip a bag if it is too warm, but trying to sleep when you’re too cold is just miserable. Bear in mind that that we are all individuals and we all feel the cold differently, and that our own resistance will fluctuate depending a whole load of factors including how much we have eaten, whether we have consumed alcohol, whether we need a wee or what kind of mood we are in!

Sleeping bags do not generate heat they only trap the heat we produce so it is vital that you get into your bag when you are giving off warmth, don’t go to bed when you are cold, have a hot meal or a hot drink or do some brisk exercise to get you nicely warmed up.

Traditionally sleeping bag manufacturers provided their own temperature ratings based on their experience, the products intended end use and the perceived environment. But each brand tested their bags in different ways and it was hard to find a fair comparison between models. So, in 2005 a European standard for sleeping bag temperature ratings, EN 13537, was introduced to give consumers a comparable guide to sleeping bag performance across a range of brands and models. The ratings have four different temperature ratings to give you an indication of the bags performance.

Upper limit: This is the highest temperature at which an average male should experience a comfortable night’s sleep.

Comfort: This is the temperature at which an average female should experience a comfortable night’s sleep. On average women sleep colder than men so this rating is some degrees above the ‘comfort lower limit’ for a man.

Comfort lower limit:  This is the lowest temperature at which an average male should experience a comfortable night’s sleep whilst lying in a curled-up body position. This used to be known as the comfort rating.

Extreme: This is a survival rating where the user is likely to suffer health damage such as Hypothermia. It should be treated with the utmost caution and not be relied on for general use.

However, the EN 13537 European Standard does not apply to down filled sleeping bags with a fill weight of more than 800g; for those bags you will have to rely on the manufacturer's experience and technical expertise, which is often more accurate!

Most reputable brands still use their own rating system alongside EN 13537, for instance the M.E “Good Night’s Sleep” and Rab’s “Sleep Limit”. These ratings are often the most accurate guide to the overall performance of a bag being used by an average outdoor enthusiast. They are based on years of expedition heritage, field trials, technological experience, and constant feedback.

But please bear in mind that all ratings are only a guide and, as mentioned earlier, there are a huge range of factors that can affect your comfort, if you are just not sure it is always wise to go for a warmer model.

The biggest difference you can make to your overall comfort is to use an efficiently insulated sleeping mat. Once you get inside your sleeping bag you instantly compress all the filling beneath you, greatly reducing its efficiency. The use of a quality sleep mat will ensure you are properly insulated from the cold ground and you will of course be a lot more comfortable. Your sleeping bag is only as good as the mat that’s beneath it; we recommend EXPED, ThermaRest or Multimat sleeping mats for comfort and insulation.

Technical Information
Weight: 1660g
Insulation: 650+ FP down & HL-ElixR Micro
Fabrics: Pertex Quantum 20D ripstop recycled polyester outer / 30D recycled polyester inner

Comfort rating: -3°C
Limit of Comfort: -9°C
Extreme: -28°C
Sizing Information
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Marmot WarmCube Gallatin 20 Stargazer/Solar Regular

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Excellent customer service. Really detailed easy to understand product descriptions on the Trekitt website, and gear reviews on the Trekitt YouTube channel made it so easy to choose the right backpack for me.
Emily - May 2020
Amazing service! Very helpful in regards sizing and what most matched my needs, despite this being done over the internet. YouTube videos of products being examined are very useful also. Would definitely use again, very fast and efficient delivery. Brilliant! Highly recommended!
David R - April 2020
Highly recommend. I usually go to the shop in Hereford as staff are alwasy very helpful and knowledgeable. So this was the first time I have purchased online and the service was just as good as the shop.
Grizzy - April 2020


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