Flip this T-shirt inside out, and it goes from warm to cold

A shirt that can keep you 14 degrees warmer or 11 degrees cooler? Heck, yeah. May is a tough month to get dressed. In many parts of the country, you don’t know if you need a sweatshirt or a T-shirt, whether you’ll be shivering or sweating. It’s a problem made only worse by climate change, as weather …

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