Winter temperatures and weather in Swedish Lapland can change quickly.
The best way to stay warm is to dress in layers rather than wearing one thick jacket

Dress in Layers – Stay Warm and Comfortable

Read more here:

• Base layer: Wool or thermal underwear to keep your body dry and warm.

• Middle layer: Fleece, wool or a light insulated jacket to retain body heat.

• Outer layer: Windproof and isolated jacket and trousers to protect against snow and cold wind.

• Feet: Warm winter boots with thick wool socks.

• Head & Hands: A warm hat that covers your ears and insulated gloves or mittens are essential, as a large amount of body heat is lost through your head and hands.

Avoid cotton clothing, as it absorbs moisture and makes you feel cold. Wool and synthetic materials keep you warm even if they become damp. 

Dressing in layers also allows you to adjust your clothing depending on your activity level and the weather.

If you need winter clothing, boots or outdoor equipment

Rent high-quality gear from Laponia Adventures:
https://laponiaadventures.com/outdoor-equipment/rent-winter-clothes/ 

For more tips about dressing for Arctic winter conditions:
https://www.swedishlapland.com/in-focus/how-to-dress-for-winter-in-swedish-lapland/