When the human anatomy loses its ideal form, the injury risk increases. Overpronation is when the feet roll inward too much. Supination is the opposite. Both over-pronation or supination stress the joints and ligaments. The X-SOCKS® 4.0 Marathon with Suppronation® Bandage stabilises the foot in its natural rolling movement and keeps it from turning inward or outward. The runner is better protected and runs more efficiently.