So I always suggest a warm base layer, your thermals are essential. I used a long sleeve top and leggings made from merino wool and they lasted me the week comfortably, and warmly. In fact, as they were all black when I wore them without any covering layer, I looked a little like a seal – added bonus. On top of this, you need a mid-layer; fleece is a great, warm material for this and if you can put a t-shirt between the two layers then even better. Then you need a top layer which should be waterproof. For my outer layer, I had some snowboarding pants with a warm fleece zip in liner which worked perfectly, but these would not be warm enough for the winter months. For a jacket, I rented a Canada Goose parka which was amazingly snug and the big hood that zipped over my face up to my eyes was a spectacular way to avoid the wind when travelling via qamutik.