Seeing the aurora in Iceland, Norway, Finland or Greenland can mean standing still, at night, outdoors, in wind and temperatures down to −20 °C. It is not the cold that ruins it: it is dressing badly.
1. Layers, layers and more layers
A thermal base that wicks moisture (merino or synthetic, never cotton), an insulating mid layer (fleece or light down) and a windproof, waterproof shell. Three layers you can open and close as you move.
2. Extremities first
Two-piece gloves: a thin liner for your phone and a thick mitten over it.
A hat covering the ears plus a buff or balaclava.
Wool socks (one good pair, not two thin ones) and waterproof insulated boots.
Thermal trousers under a waterproof outer layer.
3. Details that save the night
Chemical hand and foot warmers: weightless and last hours.
A thermos with a hot drink.
A power bank: cold drains phone and camera in minutes.
A head torch with red light so you do not ruin the group's night vision.
4. Dress for the tripod
If you plan to photograph, add one more layer than you think you need: shooting the aurora means standing still for an hour. What keeps you warm walking will not keep you warm waiting.
