New Balance Men's MT813 Trail Running Shoe 100% Synthetic and mesh Rubber sole N-ergy is a resilient engineered elastomer designed to provide shock absorption and responsiveness for the optimal ride AT TREAD is a dual-use outsole tread combining both trail and running lug designs for on and off-road Ndurance is a rubber compound for maximum durability used in high wear areas SURE LACE is a computer knit lace/chord designed with a reciprocating wave pattern that will not untie under high performance or inclement conditions