REI | HEATHER BALOGH ROCHFORT

This collaboration combines thermoregulation and biodegradation for running gear that, according to lab tests, could quickly break down in landfills.

It’s one of the most controversial mainstays of the outdoor industry: synthetic apparel. Thanks to its breathability and sweat-wicking capabilities, everything from jackets to baselayers to pants and gloves often includes synthetic materials like polyester or nylon. But these technical fibers come with an environmental downside: They can take hundreds of years to degrade.

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