tallie – the high end mountaineering stuff uses different Vibram compounds.
Its the generic hard rubber used by the vast majority of approach shoe manufacturers that its nothing like as good as the proper technical compounds.
http://www.vibram.com/index.php/us/PRESS/Faq/Faq
oes Vibram use different compounds?
Yes. Vibram uses a large variety of compounds. Each compound has its own identity, based on physical-mechanical criteria (elasticity, density, hardness and resistance to slipping, abrasion, tearing, etc.) Each compound is created to respond to the specific needs of and to guarantee maximum performance for its given use.
and with some production in China, you can guess where the basic soles come from….