Colin Snow
The Mountain Equipment Firelite is a sleeping bag designed for high-altitude touring and trekking. It is part of the brand's Extreme Light range, which is described as the lightest, most efficient bags they have ever developed. The bag uses 469g of 90-10 800 Fill Power Russian goose down in an ultralight 10D outer shell. The shell is made from Plasma 10D fabric, which is highly breathable and tear-resistant. The Firelite has a fitted mummy shape, which initially feels snug, but allows for movement during sleep.
| Characteristics | Values |
|---|---|
| Manufacturer | Mountain Equipment |
| Product Name | Firelite Sleeping Bag |
| Product Range | Extreme Light |
| Weight | 760 g (Regular) / 764 g (Regular) / 1.68 lb. |
| Fill | 469 g of 90-10 800+ Fill Power Russian goose down |
| Shell Fabric | Plasma 10D fabric |
| Shell Fabric Properties | Ultralight, highly breathable, tear-resistant, soft, comfortable, tough |
| Shape | Mummy |
| Fit | Relaxed mummy with room for feet |
| Comfort Limit Rating | EN rating: -6°C / Manufacturer's rating: -9°C |
| Features | Slant box wall construction, stretch seams, full-length two-way zip, shoulder baffle, stuff sack, storage sack |
| Sizes | Regular, Long, XL |
| Versions | Men's, Women's, Unisex |
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What You'll Learn
Mountain Equipment's Extreme Light range
Mountain Equipment has introduced a new Extreme Light range of sleeping bags, which they describe as the "lightest, most efficient bags we have ever developed." The Firelite is part of this range and is designed for high-altitude touring and trekking. The bag has a temperature comfort limit of -9°C, although one reviewer estimates that it could keep a person warm in temperatures a few degrees colder.
The Firelite bag uses 469g of 90-10 800 Fill Power Russian goose down, which has been ethically sourced and certified according to the Down Codex that puts animal welfare first. The goose down is contained within an ultralight 10D outer shell made from Plasma 10D fabric, which is highly breathable and tear-resistant. The bag's cut is described as reasonably roomy, allowing the user to wear insulated clothing inside if necessary. The bag also features a 7-baffle low-volume hood and a 4-baffle anatomically shaped footbox.
The Firelite bag comes with a waterproof stuff sack and a mesh storage bag. It has an almost full-length zip with a thick baffle behind it. The bag's EXL system, consisting of stretch inner seams, allows the down baffles to conform closer to the body shape, providing extra arm movement. The bag's elasticated seams also help it hug the body, cutting out cold spots.
The Mountain Equipment Firelite bag has received positive reviews, with users praising its light weight, warmth, and comfort. One reviewer noted that the bag felt well-constructed and oozed quality, while another mentioned that it provided astonishing warmth for its weight. The bag's ability to maintain performance at a low weight is attributed to its use of very high-quality down and light shell fabric.
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Comfort and warmth
The Mountain Equipment Firelite sleeping bag is part of the brand's Extreme Light range, which is described as the "lightest, most efficient" sleeping bag range it has ever produced. The bag is designed to maintain performance at a low weight by using very high-quality down and a very light shell fabric. The shell is made from Plasma 10D fabric, which is highly breathable and tear-resistant. The bag is filled with 469g of 90-10 800+ fill power Russian goose down, which provides optimal protection against the cold. The goose down has a high fill power of 900+ cuin and is ethically certified, with the down sourcing ethics taken seriously by Mountain Equipment. The bag's cut is reasonably roomy, allowing the user to wear insulated clothing inside if necessary.
The Firelite bag has a fitted mummy shape, which initially may feel a bit restrictive, especially for those who switch between sleeping on their back and side. However, the bag is designed with the EXL system, which consists of stretch inner seams that allow the down baffles to conform closer to the body shape, providing extra arm movement. The bag also features elasticated seams, which help it hug the body and cut out cold spots. The shell fabric is soft and comfortable, and the bag lofts brilliantly when unpacked.
The Firelite sleeping bag provides astonishing warmth for its weight. It has an EN Comfort Limit rating of -6°C, but Mountain Equipment uses its own "Good Night Sleep Guaranteed" rating of -9°C, based on extensive testing in the field and thermal imaging analysis in cold test rooms. One reviewer reported that the bag kept them warm and comfortable while camping in temperatures as low as -8°C, wearing just thin base layers inside the bag. They felt that they would have stayed warm even if the temperature dropped a few degrees lower.
The Firelite bag is perfect for high-altitude touring and trekking due to its low weight and small pack size. It comes with a waterproof compression stuff sack, allowing it to be conveniently stowed in a mountaineering backpack, protecting it from bad weather. The plasma outer's PFC-free finish also protects the fill against moisture. Overall, the Mountain Equipment Firelite sleeping bag offers a superb combination of comfort and warmth, making it an excellent choice for outdoor adventures.
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Construction and materials
The Mountain Equipment Firelite Sleeping Bag is part of the brand's Extreme Light range, described as the "lightest, most efficient" sleeping bags they have ever produced. The bag is constructed with 469g of 90-10 800+ Fill Power Russian goose down, which has been ethically sourced and certified according to the Down Codex that puts animal welfare first. The down fill power is rated at 900+ cuin and 800+ fill power, and in testing, the Firelite bag exceeded the stated 800 Fill power with a result of 835 for the batch of down used.
The bag features an ultralight 10-denier outer shell made from Plasma 10D fabric, which is highly breathable and tear-resistant for its weight. The shell fabric is soft and comfortable and has a PFC-free finish that protects the fill against moisture. The bag also has elasticated top seams, slant wall baffles, and ground-level side seams, which help it hug the body and cut out cold spots. The EXL system and stretch seams also allow for greater freedom of movement while sleeping.
The Firelite bag has a mummy shape, with a 7-baffle hood and a 4-baffle footbox that is anatomically shaped and offset. The bag comes in two sizes: Regular and XL, with the Regular bag weighing 760-764g and the XL weighing 1.68lb. The bag has an almost full-length zip with a thick baffle behind it, as well as a shoulder baffle, and it comes with a waterproof compression stuff sack and a mesh storage bag.
The bag is designed for high-altitude touring and trekking, providing optimal protection against the cold while remaining lightweight and packable. It has a temperature comfort limit of 16°F / – 9°C, although one reviewer found it kept them warm at temperatures of around -8°C while wearing thin base layers. Mountain Equipment uses its own 'Good Night Sleep Guaranteed' rating of -9°C for the bag, based on extensive field testing and thermal imaging analysis.
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Performance and weight
The Mountain Equipment Firelite sleeping bag is part of the brand's Extreme Light range, described as the "lightest, most efficient" sleeping bags they have ever produced. The bag achieves performance at a low weight by using very high-quality down and a very light shell fabric.
The bag uses 469g of 90-10 800+ fill power Russian goose down, which has been ethically certified and has a fill power of 900+ cuin. The shell is made from Plasma 10D fabric, which is highly breathable and tear-resistant for its weight. The bag weighs 760g (or 764g according to another source) and comes with a waterproof stuff sack and a mesh storage bag. The cut is reasonably roomy, allowing the user to wear insulated clothing inside if necessary. The bag is designed with a mummy shape, which some may find restrictive, but the EXL system and stretch seams allow for extra arm movement.
The bag's performance in cold temperatures is impressive for its weight. It has an EN Comfort Limit rating of -6°C, but Mountain Equipment uses its own 'Good Night Sleep Guaranteed' rating of -9°C, which has been tested both in the field and through thermal imaging analysis. One reviewer found that the bag kept them warm and comfortable at -8°C, wearing just thin base layers, and felt they would have stayed warm if the temperature dropped a few more degrees.
The Firelite bag is perfect for high-altitude touring and trekking, providing optimal protection against the cold while remaining lightweight and packable.
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Temperature ratings
The Mountain Equipment Firelite Sleeping Bag is designed for "minimum weight and maximum warmth but with no compromise on comfort". It is part of the brand's Extreme Light range, which is described as the lightest, most efficient sleeping bags they have ever produced. The bag is designed for high-altitude backpacking in the summer or lower-altitude treks in the shoulder seasons.
The bag has a comfort temperature of 4°C, a comfort limit of -1°C, and an extreme limit of -16°C. The comfort rating is the temperature at which a woman can expect to be warm enough to get a good night's sleep. The comfort limit is the temperature at which a man can sleep warmly. The extreme limit is the lowest temperature at which the bag can provide protection, but it is not recommended to use the bag at this temperature unless you are willing to risk hypothermia.
The bag's temperature ratings are supported by several design features. The bag uses 469g of 90-10 800 Fill Power Russian goose down in an ultralight 10D outer shell. The shell is made from Plasma 10D fabric, which is highly breathable and tear-resistant. The bag also features the EXL system, which uses lightly elasticated internal seams in the top half of the bag to reduce drafts and dead air space. The slanted box wall baffles and full-length zipper baffle further prevent cold drafts from entering the bag.
The Firelite Sleeping Bag's hood design also contributes to its warmth. The anatomically shaped hood wraps around the head and shoulders without restricting movement and can be cinched down around the face to trap heat. The bag's Alpine fit features a slightly more tapered design in the upper body and legs to maximize warmth and minimize weight.
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Frequently asked questions
The temperature comfort limit of the ME Firelite sleeping bag is 16°F / – 9°C. However, the bag has also been rated for temperatures as low as -9°C by Mountain Equipment and 6°C by EN Comfort Limit.
The ME Firelite sleeping bag uses 469g of 90-10 800+ Fill Power Russian goose down in an ultralight 10D outer shell. The shell is made from Plasma 10D fabric, which is highly breathable and tear-resistant.
The ME Firelite sleeping bag weighs 760g (1.68 lb) in the Regular size and 764g in the Women's version. There is also an XL version available.
The ME Firelite sleeping bag is designed with a fitted mummy shape, which some may find restrictive. However, it has stretch seams and an EXL system that allows for some movement, making it comfortable for side and back sleepers. The bag is also adjustable and has a soft and comfortable shell fabric.
