A survival guide for -20°C (as we have today): layers of clothing and wool. Wool and wool. Wool is the perfect material because it's breathing, stays dry and keeps you warm. When you have many layers of clothings you easily sweat and it's super important that you stay dry. I have wool underwear, socks, mittens, scarf, caps (not this one), sweater... almost everything. My boots are one size too big so I can wear two pairs of socks.