The stiff and thin carbon fiber insert can limit the movement of big toe and provide support, reducing foot pain and help to recover from foot injuries effectively, suitable for Morton's Toe, Turf Toe and Hallux Rigidus. Carbon fiber insert can be worn on your right or left foot. The insert must be placed directly under the removable shoe insole. For proper fit carbon fiber insert must be ¼ - ½ inch (approximately 1 cm) shorter than removable insert in shoe (because it is stiff), If in between sizes or half sizes round down to smaller size. Note: Please follow your doctor's advice to make sure this product is suitable for you. Package include: 1 piece pure carbon fiber insole/insert,not a pair.