In reply to Greasy Prusiks:
> Seems not all vibram is slippy but if you aren't careful researching the compound you may end up doing your Torvill and Dean impression.
My comment was a bit throwaway...
The problem is that you're unlikely to find out which compound a manufacturer has chosen for their shoes (sole units are commonly mentioned). And then you have to go and find out the properties of the compound. And whether it's a Vibram Europe compound, or a Vibram China compound (I downloaded PDF catalogues in 2008... Euro compounds were Mont, Tront, Anticalore, Trek, Euro & SP. The Chinese catalogue added TC1, TC4, Duraflex, Walk & Newflex)