Lightwave Firelight 350 Down Sleeping Bag

-2°C Comfort Limit (EN13537:2012), 350g of 970+ Fill Power Down (US Method)
Weighs 650g (Regular bag)
Code: SS16124
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Lightwave's Firelight sleeping bags offer amazing warmth for weight, there's no mystery though, they use the very best quality ethically sourced down in a box wall constructed bag.

Lightwave says:

The Firelight 350 is a high quality, lightweight down sleeping bag that is ideal for use in temperatures down to 0°C. Manufactured wholly in Poland, the Firelight 350 is filled with the famed Polish white Goose down that is 100% ethically recovered. The down has a fill-power of 900 cubic inches as measured by the EU norm (and is equivalent to 970 cubic inches using the US standard).

The Firelight 350 has a full length zip that lies on the top of the bag. The zip is protected by a single baffle. There is a neck collar that can be adjusted to close completely around the neck to provide a complete seal.

The Firelight 350 comes in three sizes and is supplied with a compact stuff sack and a large storage bag.

Typical use: The Firelight 350 is an excellent bag for all uses when you do not expect to be sleeping in temperatures below zero. It is ideal for travelling when one is always going to be indoors, and for trekking during the summer months at altitudes of up to 3000 metres.

Both the quality of construction and the quality of down in Lightwave's Firelight range of sleeping bags ensure that these bags achieve superior ratings when tested to the European EN 13537 standard.

Aside from this obvious quality we like some of the design features, for example the full length zip is on the top of the bag rather than the side - this seems easier to use somehow - when testing a Firelight 450 I could find the zipper much more quickly, and because it starts at the top of the bag I was less likely to turn over leaving it underneath me.

Another curious point was the lack of zip snag, every bag I have ever used snagged at some point, but the Firelight never did. I could quite work this out - but I note the zip is a smaller gauge than usual - which could be it.

Buy these bags and you are buying quality.

- Reviewed by Ultralight Outdoor Gear

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Help and advice: Choosing a sleeping bag advice
  EN 13537 rating for sleeping bags explained
  Sleeping bag shape and sizes advice
  Sleeping Bag features Page 1
  Sleepin bag features page 2
  All about down filling in sleeping bags


The construction describes how the down is held in place (otherwise all the down would fall to the bottom) and what features are incorporated to maximise heat retention or, conversely, regulate your temperature. A bag as light as the Firelight 350 does not need to have sophisticated features as there simply isn't enough down for it to be expected to perform in very cold temperatures (although it is certainly better than having nothing).

  • Baffles: Box wall throughout
  • Hood: Adjustable cowl
  • Neck: Simple adjustable baffle
  • Zip: Full length #5 YKK
  • Zip baffle: Single


Lightweight fabrics allow the down to loft and reduce the weight of the bag. Although there are lighter-weight versions of the Pertex Quantum fabric we are using, they offer a negligible saving in overall weight and, having a lower tear strength, are easier to damage.

  • Shell: 29 g/m² 15 denier nylon (Pertex Quantum)
  • Lining: 29 g/m² 15 denier nylon (Pertex Quantum)

UOG Weights

  • Short bag weighs 612g
  • Regular bag weighs 650g
  • Long bag weighs 704g
  • The total weight does not include the stuff sack or storage bag

Lightwave Specs

  • Left hand zip only
  • Packed size: 30cm x 18cm, 7.6L
  • EN13537 Comfort rating: 3°C;
  • EN13537 Lower Limit rating: -2°C
  • Fill weight: 350 g (size M)
  • Fill power: 900 EU (970 US) white Polish Goose down
  User Height Fill Weight Total Weight Zip Length Internal Width Internal Length


< 5'7"

335g 612g 135cm 80cm 175cm


5'7" - 6'

350g 650g 150cm 80cm 190cm


6' - 6'6"

380g 704g 175cm 80cm 215cm


Although there are four different measurements, the two most useful (and in our experience reasonably accurate) ones are:

  • EN13537 Comfort Rating: Temperature at which a standard adult female can have a comfortable night’s sleep.
  • EN13537 Comfort Rating: The lowest temperature at which a standard adult male is deemed able to have a comfortable night’s sleep.
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