HILO X-TERRAIN MT1 HILO X-TERRAIN MT1 3 PLY SIDEWALL Optimized tread formula design provides ultra-strong traction performance and puncture resistance. Shoulder Design Shoulder Design Open shoulder design with dilated and deepened grooves allows for easier discharge of mud when driving at low or high speeds. Enhanced Performance Enhanced Performance The large block pattern on the shoulder helps to improve driving quality by vastly enhancing performance on muddy and rocky.