These carbon fiber insoles are indicated when dorsiflexion across the forefoot is painful. By making the front of the foot across the ball of the foot with these more rigid insoles in the shoe can help reduce the pain by reducing that motion. They come in a full width of the forefoot or just under the big toe.
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See:
Full width or Morton’s Extension for a rigid carbon plate in the shoe?
Effectiveness of Shoe Stiffening Inserts for First Metatarsophalangeal Joint Osteoarthritis
Carbon Plates for Big Toe Joint Pain