Did you know that in the good old 1990s there were already clothes made of intelligent materials? Ok, compared with the latest smart clothes developments today the Thermowear Shirt is more of a retro product, but it delivered the wearer neat responses way back then, and it still does today.

How so, we hear you ask? The blue colour in the normal state of the Thermowear Shirt changes to a pale blue or even white when it becomes heated. Even putting your hand on it will make this happen – after just a few seconds, a white hand print appears on the shirt. And once the Thermowear Shirt cools, it returns to its original colour.

The applications are numerous, of course, but most impressively:
Show your girlfriend how hard you worked out – even if you're not at all sweaty! (Hint – try the hairdryer to make all the right places hot!)
No girlfriend right now? No problem – the Thermowear Shirt will help you get to know many lovely young ladies: Just ask them to try the effect, while you're wearing the shirt!

And if you want to impress the ladies with an explanation of the effect – just as a true geek should do – you can check out it in this Wikipedia article.

For a long lasting effect don't iron the shirt and don't dry it in the dryer or in direct sunlight. You may wash the shirt in the washing machine like a normal piece of clothing.
Here are the sizes of the shirt in cm. The first number indicates the width directly under the arms (B) and the second number indicates the height (H) (see also the illustrating picture):
S: 42cm / 60cm
M: 46cm / 65cm
L: 49cm / 73cm