Alie2Oxon
Yes, I talked to an Indian man once and he told me "We never go out in the midday sun"......
40 degrees is about our normal body heat, so our usual was of cooling off - to sweat - cannot work!
Interesting. When I lived and worked in Thailand, including in schools with no air-con and with temperatures in the upper thirties and low forties, I sweated masses even when standing still. I presume everyone else did too.
Admittedly, that wasn't in direct sunlight. I avoided that as much as possible, as the Thais do.
And, as your post suggests, Indians.