T-Shirt for Hot Days – Why Bamboo Keeps You Cool

Short answer: On hot days a T-shirt is about getting rid of heat and moisture. Bamboo viscose takes perspiration into the fibre and lets it evaporate, which is why a bamboo T-shirt feels cooler against the skin than a cotton one of the same thickness.

What actually cools

It is evaporation and not the fabric that cools. When moisture leaves the skin, it takes heat with it. A material that holds on to perspiration stops that process, while a material that carries the moisture out to the surface lets it happen. That is the whole difference.

Why bamboo viscose works

Bamboo viscose has long, smooth fibres that take moisture into the fibre itself and release it slowly to the air. The fabric therefore feels dry against the skin even while it is working. See the bamboo T-shirts for men in the thinnest qualities for the hottest days.

The fit on a hot day

A close fitting T-shirt moves moisture fastest, but a looser one lets air circulate between fabric and skin. On a very hot day the looser one wins, because air circulation matters more than contact with the fabric. That is the opposite of the rule that applies in winter.

Sleeves or no sleeves

When it is genuinely hot, a sleeveless cut does more than any material can. See the bamboo tank tops for men for those days. If the arms need cover from the sun, a thin, pale T-shirt beats bare skin, because the fabric shades without trapping heat.

Colour and the sun

Pale colours reflect more light and feel cooler in direct sun. Dark colours absorb the heat and turn noticeably warmer after a quarter of an hour outside. In return pale colours hide less if the fabric is thin, so the choice is always a compromise between the two.

For the women's wardrobe

The same rules apply on the women's side, where the cuts are made for a different shoulder. See the bamboo T-shirts for women, and choose a light quality with a slightly looser fit if the T-shirt is for the hottest days.

What to avoid

Dense synthetic fabrics trap heat and leave the moisture on the skin. Thick cotton qualities soak up perspiration and turn heavy and wet. Both make the problem worse on a hot day, however loose the cut, and it shows most by late afternoon.

Washing in the summer months

Wash the T-shirt the same day it is worn, at 30 degrees and without fabric softener, which lays a film in the fibres and slows moisture transport. Hang it to dry in the shade so the colour does not fade, and it is ready for the next hot day. See also bamboo and temperature regulation, better sleep with bamboo and bamboo t-shirt vs. cotton t-shirt.