The soles are really thin but very tough. I've never had anything puncture through it including broken glass, although I wouldn't want to step on a nail stickin

The soles are really thin but very tough. I've never had anything puncture through it including broken glass, although I wouldn't want to step on a nail sticking up! The wired article linked to a Tim Ferris (I think) blog post. That post had a video which will help you get a better idea of what the shoe is made from. Edit: Here is the link http://www.fourhourworkweek.com/blog/2009/05/07/vibram-five-fingers-shoes/ http://www.fourhourworkweek.com/blog/2009/05/07/vibram-five-...