What is an undershirt

Short answer: An undershirt is a thin top worn closest to the skin. It absorbs moisture from the skin, keeps the outer layer clean and adds an extra layer of warmth in the colder part of the year.

It keeps the outer layer clean

The undershirt sits between your skin and your shirt or jumper and absorbs sweat and skin oils during the day. The outer layer then stays clean for longer and can often be worn several days before washing. That spares the shirts and knitwear that take the most effort to wash, see bamboo tank top for men.

It adds a layer of warmth

A thin inner layer traps a little air against the skin, and that air holds warmth. A thin undershirt can therefore make your whole wardrobe warmer without a thicker jumper on top. In winter it makes a difference on the way to work and on days when you move between warm rooms and cold air, see bamboo sweatshirt for men.

It takes moisture from the skin

When you move or come in from the cold, you sweat a little, even without noticing. An undershirt made from a fibre that absorbs moisture draws it away from the skin and spreads it through the fabric. Your skin feels drier, and the shirt on top does not get dark patches under the arms as quickly.

The styles cover different needs

Tank tops, thin straps and slim fit with a round neck or V-neck each have their own purpose. A tank top is light and leaves the arms free. A short sleeve style protects the shirt under the arms. A round neck looks neat on its own, while a V-neck works best under an open collar, see all men's clothing.

The fit should be close

An undershirt should fit close to the body, so it does not create folds under your shirt. If it is too loose, the fabric gathers at the waist and can show through a thin shirt. It should also be long enough to stay tucked in when you raise your arms or sit down. A little stretch helps.

The colour under your shirt

A white undershirt under a white shirt can be more visible than you think, because the edge stands out against the skin. A colour close to your skin tone is often less visible under light shirts. Under dark shirts and jumpers, colour matters less. Worn on its own, you can choose any colour you like.

Washing and care

Wash the undershirt after every wear, since it is the layer that absorbed sweat and skin oils. Use a low or medium temperature and turn it inside out, so the surface wears less. Skip fabric softener, which can make the fabric less absorbent over time. Dry it on a rack, so it keeps its shape.

The undershirt all year

Many think of the undershirt as something for winter, but it is useful all year. In winter it adds warmth, and in summer it takes moisture from the skin, so your shirt does not cling. That makes an undershirt one of the most worn items in a men's wardrobe, so choose one that feels soft.

Frequently asked questions

What is the purpose of an undershirt

To absorb moisture from the skin, keep the outer layer clean and add an extra layer of warmth in the colder part of the year, so your shirt lasts longer between washes.

Which style should you choose

A V-neck if it should stay invisible under an open collar. A round neck or a tank top if you also plan to wear it on its own or for exercise.

Do people wear an undershirt in summer

Many do. A thin layer that absorbs moisture can make a warm day more comfortable than nothing at all, because your shirt does not cling to the skin.