The temperature of the shirt itself will have a majority of the impact on the heat transfer. Whether a given pigment is reflective in the ir is impossible to predict by eye, see below. Black shirts will warm you up more in general, though offer better protection against UV. You can however get special UV protective white colored shirts.
The temperature of the shirt itself will have a majority of the impact on the heat transfer. Whether a given pigment is reflective in the ir is impossible to predict by eye, see below. Black shirts will warm you up more in general, though offer better protection against UV. You can however get special UV protective white colored shirts.