what is the best material for a phone case?

[jinxerr]

Cost is not really an issue (to an extent). The only requirements are that it is as strong and thin as possible whilst remaining *slightly* flexible. I know very little about this so any help is appreciated

Edited July 31, 2012 by swansont
irrelevant link removed

[Iota]

Carbon fibre is light, thin, strong and sometimes flexible. I've seen phone cases made of the stuff too.