Chafing occurs when clothing or other accessories rub against the skin. The result is irritated, raw skin. It’s an unpleasant condition that’s well-known by plenty of runners. Make sure the belt fits properly. It should be snug without cutting off your circulation. Wear it over clothing to prevent direct contact with your skin. You may prefer to wear the belt at your hips or at your natural waist. Experiment with positioning to find what feels comfortable. If all else fails, consider applying an anti-chafing product to the affected area.