A sole of a shoe includes a container housing a compressed gas having an active ingredient and an actuator operatively connected to the container. The container has an output for dispensing the compressed gas which is operatively connected to the actuator. The actuator permits closing of the output to restrict delivery of the compressed gas and opening of the output to permit delivery of the compressed gas from the container. The actuator includes an electro-magnet adapted to produce a magnetic field from an electrical current, and a moving element configured to assume different positions under control of the magnetic field and mechanically coupled to the output so as to correspondingly close and open the output.