Earlier on in the year we (2nd year engineering) had to complete a starting a business assignment, the first part of which involved making an "Upper level pitch" (idea presentation) asking for funding from some external guests (representing investors). Our group's idea involved using a certain material (that actually exists) to make a bed cover that can cool your body temperatures down during hot humid summers.
In our argument we talked about heat–waves and the vulnerability of the old and young; we also mentioned ordinary house–holds, hospitals and such like institutions as potential customers.
The panel did not take to this idea very well and asked questions; such as "Why would you actually need a cover if its too hot, surely you can just bare all?"
Bearing in mind that this was winter time and hence difficult too ague the purpose of this product. Right now I can see all the reasons why I would need such a product because even though its too hot I'm still rolling around in a duvet.
The need to have something cosy (to snuggle up in) is what made it such great idea I feel; and of course wheather it would work as a business is different issue but still one I'm inclined to believe (but wouldn't I?) .