New Balance Men's MR790 Running Shoe 100% 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 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