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Are Nike Free minimalist? Well, compare them to something like the "Invisible Shoes", which are really sandals made out of a thin piece of rubber.
In short, just because some company says "minimal" or "barefoot" that doesn't mean they are.
And even though Vivo says their shoes are only 4mm thick at the soles (same as the Invisible Shoe), they have MUCH less "barefoot feel" because the sole is stiffer.
So, even in the minimal world, language is still not quite clear or standardized, and this could cause some problems.