Designed for athletic or casual shoes with removable inserts. Made with the same biomechanical engineering concepts used by professional athletes. They help to support your feet whether you’re running a marathon or just walking down the street. + Firm Arch Support + Antimicrobial full length cushion + Biomechanically Engineered Firm yet flexible Arch Support to help prevent falling arches and over-pronation The FirmFlex core helps to redistribute the weight of your step more evenly. This improvement helps to relieve stress that can be concentrated in the heel or the ball of the foot. Antimicrobial, High Impact, Full length Cushion for comfort as well as bacterial protection. This full length cushion offers great protection from the impacts your body experiences during activity. In addition, the AEGIS microbe shield helps keep the environment in your shoe as clean as possible.