A Hypercolor shirt was a shirt with a dye that changed color with he body heat of the wearer, like a mood ring that covered the torso. The problem with it was that it indicated the heat from the area right beneath it, turning darker with higher temperatures. Considering that the warmest area on the body include the armpits, the middle of the chest , and the lower back, one can see why the shirts are no longer being worn.
A Hypercolor shirt was a shirt with a dye that changed color with he body heat of the wearer, like a mood ring that covered the torso. The problem with it was that it indicated the heat from the area right beneath it, turning darker with higher temperatures. Considering that the warmest area on the body include the armpits, the middle of the chest , and the lower back, one can see why the shirts are no longer being worn.