For those who value being genuinely warm rather than merely padded, there is one system that works from the Ross Ice Shelf to a tram stop in Helsinki: three layers, each with one job. Our expedition crews dress this way at −50 °C. At −20 °C in a city, the same logic makes winter simply comfortable.
Layer one: move the moisture
The base layer sits on your skin and has a single task — to move sweat away before it chills you. Merino wool or technical synthetics work; cotton does not. Cotton holds moisture against the skin, and damp skin at −20 °C loses heat twenty-five times faster than dry skin. A thin merino top and leggings weigh nothing and change everything.
Layer two: hold the warmth
The mid layer is your insulation reservoir: a fleece, a wool sweater, or a light quilted jacket with thin insulation such as Bertex Plume™. The rule is trapped air, not thickness — two thin layers trap more air than one heavy one and let you regulate by removing one when you step inside. If you tend to run cold, this is the layer to upgrade, not the parka.
Layer three: keep the weather out
The outer layer is the wall: wind-proof, water-repellent, and roomy enough to close over the mid layer without compressing it. Compressed insulation is dead insulation. This is where the parka earns its price — a shell with a working membrane, storm cuffs and a real hood lets the two layers underneath do their jobs. Wind is the thief: at −20 °C with a 30 km/h wind, exposed skin experiences something closer to −35 °C.
The mistakes we see every winter
A heavy parka over a cotton t-shirt — warm for ten minutes, then damp and cold. Two parkas' worth of bulk with no wind protection. Tight boots with two pairs of socks that compress the air out and freeze the toes. In every case, the fix is not more clothing but the right division of labour.
Head, hands, feet
The three-layer rule extends to the extremities. A wool hat under the hood, not instead of it. Mittens over thin liner gloves so you can use a phone without baring skin. Boots one size roomy, one pair of proper wool socks. The body defends its core first — help the periphery.
The short version
Merino next to the skin, air-trapping insulation in the middle, a wind-proof shell on top. Add or remove the middle layer as the day changes. Dressed this way, −20 °C stops being an event and becomes just weather — which, for those of us who love winter, is exactly the point.