Slimfit Dual Medium Formthotics™ are a full-length, slim fit, dual foam for cushioning and control. The Slimfit Dual Medium forefoot is perforated for breathability, as improved airflow helps to keep the feet cool and dry. The unique shape helps to achieve a perfect fit in slim fit sports shoes or boots, and the conservative color won’t stand out in the locker room. The base is medium Formax™ foam for control and the top is softer Formax™ for cushioning and comfort. It is antimicrobial, which means it prevents the growth of bacteria and fungi which causes foot odor. Want to know more? Check out Foot Science International's website.