The latest development in the Gray-Nicolls footwear range, the Viper range of shoes incorporates the pro zone last running shoe which has been so successful in the Optimum shoe... Pro Zone Last - Sleek profile of a running shoe ensures modern look with closer fit and outstanding performance... Upper- Breathable mesh upper combined with high grade PU... Support Elements- Stategically positioned PU overlays create midfoot stability easing stress on the foot during long days in the field... I.P.S - Full length shock absorption system... HAS A NON SPIKE SOLE UNIT...