Across India's garment manufacturing hubs, summer no longer arrives as a seasonal inconvenience. It arrives as a compounding risk — one that interacts with factory design, production discipline, and supply-chain economics to concentrate thermal strain on workers who have the least power to resist it. The findings of a HeatWatch-TISS study, drawn from 115 workers, 15 factory units, and a focus group of home-based subcontracted workers in Delhi-NCR, lay out the mechanisms behind that exposure with unusual precision.