ASICS Men's GT 2000 4 Trail Running Shoe 100% Synthetic Imported Synthetic sole Fluid ride fluid ride provides the ultimate combination of bounce back and cushioning properties with reduced weight and exceptional durability Dynamic duomax support system this evolution of duomax system enhances stability and support, with reduced weight and increased platform support Rear foot and forefoot gel cushioning systems attenuates shock during impact and toe-off phases, and allows movement in multiple planes as the foot transitions through the gait cycle Guidance truss tic system this truss tic system integrates guidance line construction for enhanced gait efficiency while providing midfoot structural integrity Guidance Trusstic System This Trusstic System integrates Guidance Line construction for enhanced gait efficiency while providing midfoot structural integrity