A T-shirt for layering in winter

Short answer: In winter, the T-shirt is the base layer. It should sit close enough to move moisture away from the skin and be thin enough not to add bulk under the other layers. When the base layer works, the rest of the outfit is easier to get right.

The base layer moves moisture

If the base layer gets damp, it chills the skin, especially when you stop after walking briskly. A bamboo viscose T-shirt absorbs moisture and lets it move on into the fabric, so the skin feels drier. That is the main job of the base layer in winter. See the styles in bamboo sweat clothes.

Thin rather than thick

A thick base layer adds bulk under the sweatshirt and creates folds that press and restrict when you move. Thin fabric lies flat and leaves the job of keeping warm to the outer layers. It is the outer layers that insulate, not the T-shirt. See the thin qualities in women's most popular styles.

Long sleeves when it gets cold

Below zero, long sleeves add an extra layer on the arms without adding weight. You notice it most when cycling or waiting for the bus, when the wind finds its way up the sleeves. A long sleeve T-shirt as the base layer closes that gap. See the styles in long sleeve bamboo T-shirts.

Three layers is the basic rule

A base layer that moves moisture, an insulating layer such as a sweatshirt or knit, and an outer layer that keeps wind and rain out. This split makes it easy to adjust as you go in and out during the day. You take off the outer or middle layer and keep the base layer on.

The fit should sit close

The base layer needs contact with the skin to move moisture. A loose T-shirt that hangs freely leaves moisture on the skin and bunches in folds under the jumper. Choose a size that sits close without squeezing across the shoulders and chest. The sleeves should reach the wrist, even when you stretch your arms forward.

Indoors and outdoors

In winter you often switch between cold air and warm rooms. A good base layer makes those changes more comfortable, because you do not get clammy indoors or cold when you head out again. Take off the middle layer inside rather than wearing too much. That way the T-shirt stays dry all day.

Colours under other layers

For the base layer, neutral colours are the most practical, as they do not show through light jumpers or peek out at the neck. White, grey and skin tones disappear under a light sweatshirt. Black and dark grey work under dark layers. Choose two or three colours that suit what you most often wear on top.

Wash after wearing

A base layer collects sweat and skin residue, even when you do not feel you have sweated. Wash it after each wear at 30 to 40 degrees and let it air dry. Avoid fabric softener, which can leave a film on the fabric and reduce how well it absorbs moisture. That way it keeps working all winter.

Frequently asked questions

How many layers are enough in winter

Three is a good starting point. A base layer that moves moisture, an insulating one and a windproof outer layer that you can take on and off as needed.

Can you wear cotton as a base layer

You can, but cotton holds on to moisture and can feel cold when you stand still after moving. On quiet days indoors it matters less.

Should the base layer be tight

It should sit against the skin without squeezing. Without contact, moisture is not moved, and fabric that is too tight feels uncomfortable under several layers.