Stability running shoes add medial support — extra structure on the inner side of the midsole — to limit inward rolling of the foot (overpronation). They are designed for runners whose feet roll inward significantly through the gait cycle in a way that causes or risks causing injury.
A physio, podiatrist, or gait specialist has told you that you overpronate. You have experienced repetitive knee pain on the inner side linked to your gait. You have worn the inner edge of previous shoe soles down significantly faster than the outer edge. You have developed shin splints or arch pain when running in neutral shoes.
You run comfortably in neutral shoes without recurring pain. You have flat feet but have not been told you overpronate. You have assumed you need stability because your arches are low.
Flat feet do not automatically mean overpronation. Many flat-footed runners pronate within normal range and run comfortably in neutral shoes for years.
Get a free gait assessment at a running specialist before deciding. Most running shops offer this service. It takes 10 minutes and answers the question properly.
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Editorial note: not medical advice. For persistent pain or injury, consult a physiotherapist or podiatrist.