New Balance Men&#39;s MT100 Trail Shoe,Black/Grey,13 D US,New Balance,MT100BK" /> Synthetic and mesh ACTEVA is 12% lighter than standard midsole foam with DuPont Engage for exceptional durability ROCK STOP is a flexible protective layer that protects feet from rocks and shock, minimizing pressure, and dispersing shock energy EVA foxing construction Puncture resistant toe material SURE LACE is a computer knit lace/chord designed with a reciprocating wave pattern that will not untie under high performance or inclement conditions