Quick answer: In direct sun, a black T-shirt does absorb more heat than a white one. But how hot you feel depends just as much on fit, airflow and fabric. A famous 1980 study found people in loose black robes were no hotter than people in white ones. Darker and deeper colours also block more UV. For running in strong midday sun, go light; for shade, evenings or the gym, wear any colour you like.
It's one of those things everyone grows up hearing: wear white in summer, black will cook you. In much of India, where April and May regularly cross 40°C, it sounds like common sense. But the science is more interesting than that.
Yes, black absorbs more sunlight
This part is true. Darker colours absorb more of the sun's energy, while lighter colours reflect more of it back. Standing still in the noon sun, a black T-shirt will warm up more than a white one. If that were the whole story, the answer would be simple. It isn't.
The desert robe experiment
In 1980, researchers published a study in the journal Nature with a brilliant question: why do Bedouins, who live in some of the hottest deserts on earth, often wear black robes?
They compared people wearing black and white robes out in the desert sun. The black robes absorbed about 2.5 times more solar heat than the white ones, but the people wearing them were no warmer. The researchers' explanation was airflow. The heat soaked up by the outer layer of a loose robe warms the air underneath, which rises and escapes, pulling cooler air in behind it like a chimney. The extra heat never reaches the skin.
Not everyone agreed with the chimney theory, and critics pointed out that Bedouins often wear white when crossing open desert. But the experiment made one thing clear: how loose and breathable a garment is can matter as much as its colour.
The twist: dark colours protect your skin better
Colour also changes how much ultraviolet (UV) radiation gets through to your skin. In 2009, scientists in Spain tested cotton fabrics dyed in different shades and found that deep blues and deep reds blocked more UV than lighter shades like yellow. Darker, more intense colours absorb UV before it reaches you.
So a light tee may feel cooler in the sun, while a darker one may give your skin a little more protection. If you train outdoors in the morning sun regularly, that's worth knowing. Fabric weave and thickness matter too, so no T-shirt replaces sunscreen.
What this means for you
- Running or cycling in direct midday sun: go for lighter colours like white, beige, mint or light grey. They reflect more heat.
- Early morning or evening runs: colour hardly matters for heat, because there's little sun to absorb. Wear whatever you like.
- Indoor gym: no sun, no difference. Choose the colour you feel good in.
- Long outdoor sessions where sunburn is a risk: a deeper colour like royal blue, teal or coral red offers more UV protection.
- Whatever the colour: a breathable, quick-drying fabric with a comfortable, not skin-tight fit lets air move and sweat evaporate, which is what really keeps you cool.
The bottom line
Black isn't automatically hotter and white isn't automatically cooler. In strong sun, light colours win on heat; dark colours win on UV protection; and in every case, airflow and fabric matter as much as colour. Which means you can stop dressing only in white all summer.
Our crew neck training tees come in 30 colourways, from white and mint to royal blue, coral red and black.