Topo Athletic MTN Racer 3 Trail-Running Shoes - Men。PRODUCT DESCRIPTION The MTN Racer 4 is engineered as a precision trail platform for runners who demand speed, control, and protection across technical terrain. Designed to perform equally well on race day and high-output training efforts, it balances responsive cushioning with a stable, ground-aware feel for confident movement over unpredictable surfaces. A 33 x 28 mm ZipFoam midsole forms the foundation, delivering high-level impact absorption while maintaining a responsive, energetic ride. Tuned for efficiency, the platform provides enough protection to buffer sharp trail features without disconnecting the runner from the terrain. The result is a ride that remains agile and controlled, even as conditions become more aggressive. Underfoot traction is handled by a Vibram® Megagrip outsole, selected for its proven performance on wet rock, loose soil, and hardpack. The lug configuration is optimized for multi-directional grip, allowing for secure climbing, braking, and lateral stability when navigating technical lines at speed. The upper system is refined for precision and durability in demanding environments. A performance-tuned fit works in tandem with the FKT insole, which uses closed-cell construction to resist water uptake and promote rapid drainage in wet conditions. An updated gaiter interface adds modular protection against debris, making the MTN Racer 4 a reliable tool for sustained efforts in rugged terrain. FEATURES * Responsive Cushion Platform: 33/28 mm stack