Standing still under the aurora for hours in the Arctic winter is a different challenge from any day-hike or ski trip — you generate almost no body heat, so what you wear is the whole game. Pack well and minus twenty-five feels like an adventure; pack badly and you will be back in the vehicle within twenty minutes. Here is exactly what to bring.
The layering principle
Warmth comes from trapped air between layers, not from one thick garment, and staying dry matters as much as staying warm. Build three layers: a base that wicks sweat off your skin, a mid layer that insulates, and an outer shell that blocks wind. Never use cotton anywhere in the system — it soaks up moisture and chills you. The beauty of layers is control: you can shed one walking to the viewing spot and add it back while you wait.
Base layer
Start with a merino wool or synthetic thermal top and leggings worn against the skin. Merino is the gold standard — warm, breathable, and it resists odour over multiple wears. Bring two sets so one can dry while you wear the other. Avoid anything cotton, including everyday underwear worn alone; a thermal set is the foundation everything else builds on.
Mid layer
Over the base, add insulation: a heavyweight fleece or a light down/synthetic sweater on top, and fleece-lined trousers or a second thermal layer on the legs. On the coldest midwinter nights, two mid layers up top is sensible. This is the layer you adjust most, so pick pieces that are easy to add and remove with gloves on.
Outer layer
Your shell must stop wind and repel snow: an insulated, hooded winter parka and waterproof over-trousers or a snow suit. Most reputable operators lend a full insulated oversuit for the tour itself, which is why you do not need to buy expensive expedition gear — but you still want your own warm outer layer for airports, transfers and daytime. Confirm with your operator what is provided before you overpack.
Feet: the first thing to get cold
Cold feet end more aurora nights than cold anything else. Wear thick merino wool socks — one good pair, not two thin pairs that restrict circulation — inside proper winter boots rated to at least minus thirty, with room to wiggle your toes. Tight boots cut off blood flow and defeat the insulation. Operators often provide heavy outer boots for the tour; bring warm boots of your own for the rest of the trip, plus adhesive toe warmers as insurance.
Hands and head
Use a two-part hand system: thin liner gloves that let you operate a camera or phone, worn inside thick insulated mittens (mittens beat gloves for warmth because the fingers share heat). For your head, a warm hat that fully covers the ears is essential, and a neck gaiter or balaclava seals the gap between hat and collar — vital in December and January. A large share of body heat escapes from an uncovered head and neck.
Warmers, camera and the small essentials
Disposable hand and toe warmers are cheap magic — bring plenty. For photography, pack a tripod, spare batteries (kept warm in an inside pocket, as cold drains them fast), and a lens cloth for frost. Add a headlamp with a red-light mode to protect night vision, a thermos of hot drink, lip balm and moisturiser for the dry air, and sunglasses for the bright daytime glare off the snow.
What NOT to bring
Leave the cotton hoodies, denim jeans and canvas trainers at home — they are useless in Arctic cold and often the single reason travellers cut a night short. You also do not need to buy a full polar expedition wardrobe: between your layers and the gear your operator supplies, you are covered. When in doubt, spend on good socks, boots and mittens before anything else.
Quick packing checklist
Merino base layers (×2 sets) · fleece/insulated mid layers · insulated parka · waterproof over-trousers or snow suit · thick wool socks · winter boots to −30°C · liner gloves · insulated mittens · warm ear-covering hat · balaclava/neck gaiter · hand & toe warmers · headlamp (red mode) · tripod & spare batteries · thermos · lip balm & moisturiser · sunglasses. Get those in the bag and the cold becomes part of the magic rather than the enemy.