Underwear for hot weather, what works best

Short answer: For hot weather underwear works best when it is thin, soft and close-fitting without squeezing, and when the fabric takes up moisture. A short leg gives the most air. Viscose from bamboo is a natural choice for many, but cut and size matter at least as much as the fibre.

What happens when it gets hot

When the temperature rises, you sweat more, and the fabric next to the skin soon feels clammy. You notice it most in the crotch and on the thighs. So underwear for hot weather is about how the fabric handles moisture, not only about how thin it is.

Thin and soft fabric

A thin knit gives less heat against the skin and dries faster than a thick one. Viscose from bamboo is smooth and soft and feels cool to the touch for most people. Look for a light knit without thick seams, so heat and moisture do not collect where the fabric lies double.

Short or long leg in the heat

A short leg gives more air and less fabric on the thighs, but can cause rubbing if you walk a lot. A slightly longer leg protects the skin from rubbing but adds fabric. Many choose a short leg for quiet days and a longer one for days with many steps. This is where bamboo boxer briefs in several lengths come in.

Fit in the heat

Close-fitting does not mean tight. If the underwear is too tight, it holds the heat and presses, and if it is too loose, it bunches. Choose the size where the waistband lies flat and the leg does not press, so you can move freely even when the day is long and hot.

Care in summer

You wash more often when it is hot, so care matters more. Wash by the care label at low to moderate temperature, and do not use too much fabric softener, which can coat the fibres and make them less airy. Hang them to dry if you can, so the fabric keeps its shape.

The rest of your clothes in the heat

The underwear is only one layer. Choose loose clothes on top and think about your feet too. There socks for men in thin material can help, and for cool evenings long sleeve models are easy to put on and take off.

What you cannot expect

No underwear stops you sweating when it is hot. What you can achieve is to be a little more comfortable and to stop the fabric sticking. If you have skin problems in the heat, talk to your doctor instead of expecting the fabric to solve it.

How to try your way through

Try two pairs in two cuts for a week in hot weather. Notice which feels most comfortable when you walk, sit and sleep. Write a short note so you remember it next summer. That way you learn which cut works for you.

Frequently asked questions

Which fabric is best for hot weather

Thin, soft fabrics that take up moisture work best for many people. Viscose from bamboo is a popular choice, but cut and size matter at least as much.

Should the leg be short or long

Short gives more air, long protects against rubbing. If you walk a lot, a slightly longer leg can be more comfortable even in the heat.

Do I need to wash more often in summer

Yes, most people wash more often because you sweat more. Follow the care label and use a mild wash and little fabric softener.