Around the world, climates that were once comfortably temperate, from the Atlantic to the Pacific, are getting warmer and more humid. Summer 2025 was hot — hotter than ever, but are our clothes ready to beat the heat?

In 2020, the U.S. National Climate Assessment reclassified New York City from a coastal temperate zone to a humid subtropical climate zone. Now, the city is feeling it like never before, hit with a June heatwave that clocked in as the hottest day since July 2012, according to the National Weather Service.

As the last century of human activity has warmed the planet at an unprecedented rate, fashion's attempts to address the growing need for temperature regulation have not only fallen short but have added to the crisis. Brands still largely rely on fossil fuel-based textiles

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