You remember Global Hypercolor, right? Those heat-sensitive t-shirts that changed color as you wore them (and then went all funny-looking after a few washes)? We loved ours so much. In fact, we still have a picture of ourselves wearing it at the gates of Disneyworld, circa 1992 (no, you can't see it...) Anyway, now that same technology has been appropriated into another item of apparel: panties.

Made by Green Knickers, an ethically-minded UK lingerie company, the panties have a motif on the front which changes color as you... um... get hotter. They come in pink with a daisy motif, or yellow, which features a tree design. They are fair-trade, made from organic cotton and the ink is organic, too.

The only thing we don't understand is... why?

If you would like to give them a try, find them at Ethical Superstore for £15 (around $30).

[via Hippyshopper]