Inov-8 Men's TrailFly Ultra™ G 300 Max - Green/BlackThe TRAILFLY ULTRA G 300 MAX is a revolutionary trail shoe featuring the worlds first Graphene enhanced foam, called G FLY. The foam delivers 25% greater energy return and retains its optimum levels of underfoot rebound and comfort for longer, so runners feel faster and fresher over greater distances. Pioneering a new way for cushioned ultra running shoes, the TRAILFLY ULTRA G 300 MAX also features a unique underfoot ADAPTER FLEX groove, allowing it