| http://www.w3.org/ns/prov#value | - In short, when the insole according to the invention, is applied to the traditional sole in wood or other material, for clogs or mules, the ball of the foot comes to rest on a series of humps which are hollow inside, and within which air is hermetically sealed, due to the fact that they are enclosed by the part of the sole to which the insole has been glued.
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