4 Season Mummy Sleeping Bag

• Goose down fill from 400 g to 3000 g depending on the model
• Mummy cut that trims dead air space to hold heat around you
• Polyester shell fabric
• Total weight from 850 g to 3000 g across the range
• Maker comfort ratings from 0 to -10°C (400 g fill) down to -30 to -35°C (3000 g fill); extreme figures of -3°C to -45°C are survival limits
• Packs from 28 x 17 cm up to 55 x 30 cm; colours Orange, Black, Green, Blue and Red
• Dispatched after 3 to 5 business days of processing, delivered within 10 to 20 business days

Goose down in a mummy cut

Goose down gives you the best warmth for the weight you carry, and the tapered mummy shape makes the most of it by cutting the dead air your body has to heat. The range starts at 400 g of fill for cold nights and climbs to 3000 g for hard winter, with total weight rising in step. Packed size follows the same curve, from a compact 28 x 17 cm at the light end to 55 x 30 cm for the warmest model.

Getting the rating right

Down is warmest by weight but loses loft once it wets through, so keep it off damp ground and let it air each morning. Choose by the comfort figure, which is the temperature you can sleep at, not the extreme number that only marks survival. Match the model to the coldest night you expect and add a liner for a margin. Returns within 30 days of delivery.