Developed through a joint research project between Hiroshima University and Labonetz. Features: A specially shaped arch promotes smooth weight transfer to the ball of the foot, and a 6-degree incline combined with toe grip provides strong support. Material: Uses a material called "Nyupunyu Gel." Purpose: Insoles designed to "firmly support walking." Please use with shoes that are 3E or wider. If using with shoes that have thick insoles, please remove the shoe's original insoles before use. Size M (23-23.5cm) Please understand that this item is stored at home.