Model Comfort temperature Lower limit temperature Weight Fill Weight Activity
Firelight 150 12°C 7°C 395g 150g Equatorial / tropical travel
Summer trekking below 1000m
Ultra marathons
Firelight 250 6°C 1°C 500g 250g Equatorial / tropical travel
Summer trekking below 2000m
Mountain marathons
Firelight 350 3°C -2°C 620g 350g Non-mountain travel
Summer trekking below 3000m
Alpine trekking using refuges
Firelight 450 0°C -5°C 760g 450g Lightweight summer alpine
Summer trekking up to 5000 metres
Spring / autumn trekking up to 4000 metres
Firelight 550 -3°C -8°C 880g 550g Summer alpine climbing
Summer trekking up to 5000 metres
Spring / autumn trekking up to 4000 metres
Firelight 650 -5°C -12°C 940g 650g Himalayan trekking up to 6000 m
Spring/autumn backpacking to 5000 m
Winter camping below 3000 m
Firelight 750 -7°C -14°C 1 050g 750g Himalayan trekking up to 6000 m
Spring/autumn backpacking to 5000 m
Winter camping below 3000 m