Hypercolor was a line of clothing, mainly T-shirts and shorts, that changed color with heat.They were manufactured by Generra Sportswear Company of Seattle and marketed in the United States as Generra Hypercolor or Generra Hypergrafix and elsewhere as Global Hypercolor. They contained a thermochromic pigment made by Matsui Shikiso Chemical of Japan, that changed between two colors – one when cold, one when warm. The shirts were produced with several color change choices beginning in 1991.