Patented, prefabricated orthotic design to treat subtle cavus foot. The Arch Rival promotes natural foot function by improving stabillity, adding shock absorption and alleviating pain.  Recessed area under 1st metatarsal head to accommodate the plantar-flexed 1st ray.  Elevated heel to cushion and accomodate excessive heel strike force and tight calf musculature. Anti-microbial, treated thermodynamic material helps prevent blisters and odor.