Myth, layers always make you warmer

Short answer: Layers only work if there is air between them. Squeeze three layers together under a tight jacket, and they insulate less than two layers with room in between. The number of layers is not what decides it.

Where the myth comes from

The advice to dress in layers is good, which is why it is so common. But it often gets shortened to the idea that more layers always mean more warmth. So people add another sweater under their jacket and wonder why they are still cold. The explanation is not in the layers themselves, but in what happens between them.

Air between layers is the point

It is the air spaces that insulate, not the number of layers. Each layer traps a thin pocket of still air, and those pockets hold on to body heat. Two layers with a little room between them can keep you warmer than three layers pressed tightly together, see the women's range.

Too many layers push the air out

Under a close fitting outer jacket, a third layer can do more harm than good. When there is no room, the layers get compressed and the air pockets disappear. The clothes can also pull across your shoulders and arms and restrict movement. Make sure the outer layer has enough room for what you wear underneath, see bestsellers for women.

One damp layer ruins it all

If one of the layers gets wet, heat is drawn away no matter how many layers you wear. It might be sweat from a brisk walk or rain that gets through. Moisture conducts heat far better than dry air, so a wet inner layer feels cold even with dry layers on top. Dry layers matter more than many layers, see Copenhagen Bamboo bestsellers.

Three layers, each with a job

A simple rule of thumb is three layers. A thin inner layer against the skin that moves moisture away. An insulating mid layer that holds air. And an outer layer that stops the wind and keeps the rain out. Each layer has its own job, and when they work together you rarely need more than three.

The inner layer matters most

The layer against your skin decides whether you stay dry. A soft, breathable inner layer that draws moisture from the skin makes the other layers work better. An inner layer that keeps moisture close to the body does the opposite. Choose your inner layer with care, because it is the base for everything else.

Match layers to your activity

If you are moving a lot, cycling or walking fast, you will warm up along the way. It is better to start a little cool and be able to take a layer off than to sweat through all of them. If you are standing still, at a bus stop for example, you need more insulation. Layers give you exactly that flexibility.

Indoors the same applies

Indoors, too, layers work best with air between them. A thin top under a loose cardigan keeps you warmer than a thick, tight sweater on its own. And when you come in from the cold, you can take off the outer layer instead of sweating. Soft everyday clothing that combines in layers makes it easy to adjust through the day.

Frequently asked questions

Do more layers always make you warmer

No. The layers need air between them. If they are pressed together, the air spaces and the insulation disappear, and an extra layer helps very little.

How many layers are ideal

Usually three. A thin inner layer that moves moisture, an insulating mid layer and an outer layer that stops the wind and rain.

What ruins layering

Moisture. A wet layer draws heat away from the body no matter how many dry layers are on top, so keep the inner layer dry above all.