The mercury hit 49 degrees Celsius in Dhaka last April. In Vietnam’s textile belt, temperatures have exceeded 40 degrees for fifteen consecutive days in each of the past three summers. Across the global south’s garment-producing regions, extreme heat has shifted from a seasonal inconvenience to a structural threat to production capacity, worker safety, and delivery reliability. The fashion industry’s supply chain, built for a climate that no longer exists, is beginning to crack.
The immediate human cost is the most urgent. Garment factories in Bangladesh, India, and Pakistan routinely exceed safe working temperatures by midday, with indoor conditions in non-air-conditioned facilities reaching 38 to 42 degrees Celsius. Heat stress leads to dehydration, fainting, reduced concentration, and a sharp increase in accidents with cutting and sewing machinery. Worker productivity drops by an estimated 15 to 20 percent above 35 degrees, creating a direct financial incentive for factory owners who have historically resisted investment in cooling infrastructure.
What is missing is not the solution but the will to implement it at scale. Brands that audit their suppliers for labor violations rarely include heat exposure as a measured metric. The price of a reflective roof — roughly $2 per square meter — is minuscule compared to the cost of a production delay or a factory closure. As heat records continue to fall, the question is whether the industry will act before the next catastrophic season forces its hand.
The path forward is not speculative. Simple, cost-effective measures exist and have been proven in pilot programs run by the International Labour Organization and the Sustainable Apparel Coalition. Reflective roof coatings reduce indoor temperatures by up to 5 degrees. Strategic ventilation placement and evaporative cooling systems cost a fraction of full air conditioning and can reduce heat stress by meaningful margins. Shifting working hours to cooler parts of the day — a policy known as ‘heat-wave scheduling’ — has been adopted by a small number of factories in India with positive results.
