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You have never experienced anything
like the
Springbak
Springsole. It fits under your shoe's existing
insole, snug against the hard surface of the shoe, and
custom fitted to your foot. It's only 1/16th-inch thick,
so there's no need to change your shoe size. So what's
it made of? It's made of space-ages polymer, similar to
a material in the "Superball".
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