The Guide uses a firmer foam section on the inner side of the midsole — a medial post — to limit inward rolling of the foot. This supports runners whose feet collapse inward (overpronate) through the gait cycle.
Many flat-footed runners pronate within normal range and run comfortably in neutral shoes. The Guide is appropriate when flat feet accompany genuine overpronation that causes discomfort or has been flagged by a specialist.
If you have never been told you overpronate and you run without foot, knee, or hip discomfort in neutral shoes — there is no reason to switch to the Guide.
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Editorial note: not medical advice. For a personal assessment, consult a physiotherapist or podiatrist.