of Clean outsole
The Clean outsole enjoys a unique advantage: The Frotte&Go system. A simple rubbing of the soles against each other is enough to clean them. Simple, but dreadfully effective.
Take the test, it's edifying. A traditional sole, during the walk will accumulate a maximum of particles (stones, leaves, soil, etc.). With the CLEAN sole, particles find no place to embed themselves. The simple unwinding of the foot when walking increases the distance from the tubular structure, and thus expels the restraints.
More effective than the traditional ridge to avoid twisting of the foot. The tubular structure of the Clean sole maximises adherence of the sole. The foot thus enjoys optimum support.