vibram sole.
i got mine a bit used, and the flap in the inside of the shoe was just starting to show.
scared me for 20 seconds straight, but afterwards it was all comfort and bliss.
one of the best visvim shoes ever designed and made.
the comfort is clearly the best within the fbt range.
sizing wise, im usually a US9. and US 8 fits perfect. fits snug, not too loose.
if you're a us 8.5, US8 will still work for you.
