Shirts by Radiate Athletics let you see how hard you are working out.

For some of us, just walking to the gym feels like a workout. And when we get there, any exercise is good exercise, and when we break a sweat, we know we are working hard. But the folks at Radiate Athletics have a better way: an exercise shirt that not only keeps you dry but also changes color based on the heat given off by your body, showing which muscles are actually burning.

Currently available through Kickstarter (where it surpassed its goal in two days), Radiate uses color change technology and thermochromic inks and dyes that change color as the temperature changes, revealing the current level of your performance in terms of output of heat.

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