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Using the highest quality 800 fill power Russian down, an incredibly lightweight outer fabric and an alpine fit, Mountain Equipment have designed this bag to be as technically efficient, light and as compressible as possible. 
Using the highest quality 800 fill power Russian down, an incredibly lightweight outer fabric and an alpine fit, Mountain Equipment have designed this bag to be as technically efficient, light and as compressible as possible. 
Mountain Equipment

Mountain Equipment Firefly XL Sleeping Bag Ombre Blue

£342.00  £380.00  10% off
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With Pre-Order, you can purchase the latest items added to our store in advance of them arriving with us.

Your Pre-Order is prioritised (at no additional charge); meaning that as soon as the product arrives with us, we can wrap it straight back up; ready for collection via Click & Collect or despatch to you — it often never even hits the stock room shelves!

Pre-Launch

With Pre-Launch, the date when we expect to receive the product ourselves is still a little too hazy to be confident in accepting Pre-Orders.

So, instead, you can submit your email address against the item you are interested in and we will email you as soon as stock arrives on the system.

Estimated Delivery & Collection Dates

Estimated Delivery & Collection Dates are given on Pre-Order and Pre-Launch products. They are for indication purposes only and can change at any time without notice.

The dates we provide are based on indications given by our suppliers. Whenever we get updated information from our suppliers we will endeavour to update the Estimated Delivery & Collection Dates provided on product pages.

We estimate this will be ready for despatch to you or collection via Click & Collect on the Undetermined

Mountain Equipment Firefly XL Sleeping Bag Ombre Blue Information

Season : 2021W R

Brand : Mountain Equipment

Code : 002251.01318.XLBLU.XL

Mountain Equipment have designed this bag to be one of the most technical and efficient bags they produce, aiming it those who are at high altitude, whether that's mountaineering or climbing. This particular model features 6 inches of extra length to accomodate the taller chap. If you're anywhere between 6ft 1 and 6ft 6, we would opt for the XL over the standard length.

Using a super high quality 800 fill power Russian Goose down, the Firefly will pack up smaller than a similar bag with an inferior quality down and will be warmer for the weight too. What makes Mountain Equipments down different to others however is that they became one of the first outdoor brands to introduce independant autiding of their down supply. This provides the ability for M.E to trace 100% of their down, allowing them to only use responsibly sourced down. This is not only better for the birds and the environment, but also means the down inside the product is a higher quality. This premium duck down is from the very cold North East of China and is collected from ducks that live a truly free-range existence. The birds are sold when they no longer produce eggs or when the market price for eggs drops below the break-even point. The birds are normally around 700 days old when slaughtered, they are then plucked and the down is shipped to the processing plant for cleaning and grading. Because these ducks are older and have lived in a free-range environment and a cold climate the down they produce is of an exceptionally high quality. All Mountain Equipment bags adhere to the Down Codex, a scheme that was developed to ensure that both animal welfare and down quality were put firmly at the heart of each and every one of M.E's down products. The Down Codex is a completely transparent and auditable system to ensure that:

  • The down used does not come from birds which have been live plucked or live harvested
  • The down used does not come from birds which have been force-fed
  • The down used should be from birds which have raised in good conditions and to high standards of animal welfare
  • The down used should be a by-product of the meat industry and come from birds which have been humanely slaughtered

Each down product is marked with a 12 digit code that can be entered at the Down Codex website to gain access to the specific information relating to the down source of that product, go to http://www.thedownproject.me.uk/index.php to find out more about how M.E have become the only brand to go beyond accepting written guarantees from down suppliers and to make their audit results and independent quality reports publicly available.

All this ethically produced and high quality down is encapsulated in M.E's own Plasma 10D outer fabric. This exceptionally lightweight outer fabric is one of the lightest downproof fabrics in the world, only ever being used for the most compressible and lightest bags Mountain Equipment make. Thanks to the densely woven structure of Plasma, Mountain Equipment guarantee this bag to be 'downproof', meaning down cannot escape from the bag over time. As a consequence of this, the fabric has a surprisingly large amount of tear resistance, giving you peace of mind on longer or more remote trips. Plasma is not only super lightweight and tear resistant, but it breathes extremely well too. Even though you want to keep a lot of heat in the bag to maintain your warmth, you don't want to be sweating buckets. 

Mountain Equipment's bag's are very unique in a number of ways. One is the way they optimise their heat efficiency by changing the layout of the baffles. By slanting the baffles throughout the entire main body of the bag, it allows all unused space is eliminated which lowers the weight. Further weight is then saved by using their stitch through construction. This method also spreads the down out more evenly across the top, side and bottom of the bag, providing a warmer experience and a longer lifespan. The overall down distribution also allows M.E to favour certain parts of the bag to offer the highest warmth for the weight. Slightly favouring the underside of the bag, the underside of the hood and the foot piece, M.E can provide a warmer bag due to their experience of where most heat is lost. Offering more/less down in certain areas also improves the comfort, mainly in the collar area and around the head. 

Each one of their sleeping bags features a unique foot piece section depending on the use of the bag. In this case the bag is designed to be as light and as compressible as possible. The Extreme Light range of bags feature the Trapezium 4 foot piece, a four part baffle system that is engineered to be their lightest and most tecnnical system to maintain the lowest weight possible. 

A high percentage of your body heat is lost through your head so Mountain Equipment have developed their hood which uses 7 baffles to create a truly anatomical shape to surround your head with luxurious warmth. To further optimise insulation M.E have developed the Gemini System that has two overlapping anti-snag draft tubes and a fully integrated neck collar. 

The Firefly is one of the lightest bags M.E make (or just about anyone makes). It's compressible, extremely warm and has more features than you can count on both hands! If you're searching for a high altitude summer/spring bag that'll leave lots of space left in your bag, you can't go far wrong with the Firefly. 

  • Plasma 10D outer shell is incredibly light and exceptionally breathable
  • 274g of Russian Goose Down (800FP)
  • Alpine fit with EXL system
  • Slanted box wall baffles throughout
  • Ground level seams
  • 7 baffle low volume anatomically shaped hood
  • 4 baffle anatomically shaped and offset foot-box
  • Full length Gemini zip baffle
  • Plasma 10D inner throughout
  • Supplied with waterproof roll-top stuff sack and storage cube
 

 

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 an insulated sleep mat. After all, comfort is what you want 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 we are all individuals, so we all feel the cold differently and that our own resistance will fluctuate depending on 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 product's intended end-use and the perceived environment. However, 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 bag's performance.

Comfort Rating: 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 Limit Rating: This is the lowest temperature at which an average male should experience a comfortable night’s sleep whilst laid down in a curled up position.

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, Mountain Equipment's “Good Night’s Sleep” and Rab’s “Sleep Limit”. These ratings are often the most accurate guide to the overall performance of a sleeping bag being used by an average outdoor enthusiast because 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. Therefore using a quality sleep mat will ensure you are properly insulated from the cold ground, and you will be a lot more comfortable... Basically, there is no point in buying a top-quality sleeping bag if you are just going to lie down on the floor.

Technical Information

Weight: 560g

Fill weight: 274g

Comfort rating: 2°C

Comfort limit rating: -3°C

Extreme rating: -20°C

Good night sleep guaranteed rating: -3°C

Sizing Information

Pack size: 25cm x 19cm x 16cm

Max User Height: 200cm

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