Sublite Cushion Work achieves maximum lightness and flexibility in a work shoe. With deep flex grooves, the Sublite foam midsole reduces weight and allows for greater range of motion. The Reebok SD dual resistor provides additional protection by exceeding the ATSM standard for electrostatic dissipation, shielding you and your equipment from potentially hazardous static discharge. With two resistors, you'll always have a backup.