Optimum grip the dual c sticky rubber outsole compound of hard and sticky rubbers grasp even the slick rock while the multi directional lug pattern compliments the footrsquos natural movement and allows for debris release perfect for hot days the lighter more breathable upper materials deliver increased comfort for hot feet superior comfort the 8mm drop and 16mm8mm stack heights offer more underfoot for longer miles training or even racing solid protection a double layered lightweigh