Finn Comfort uses European and UK sizing. Conversions to American sizes are approximate. Please measure both feet and refer to these charts for guidance only. Finn Comfort shoes offer serious support. Not just for your feet, but for your entire body. Their no-nonsense orthopedic design reflects the latest medical research. Finn Comfort footwear contributes to your overall well-being by promoting strong and vigorous health in muscles and bones while easing strain on hips, knees and spine.