Manmade,Mesh Imported Rubber sole I.G.S (Impact Guidance System) Technology – ASICS design philosophy that employs linked componentry to enhance the foot’s natural gait from heel strike to toe-off. Rearfoot and Forefoot GEL Technology Cushioning System – Attenuates shock during impact and toe-off phases, and allows movement in multiple planes as the foot transitions through the gait cycle. Guidance Trusstic System?Technology – This Trusstic System Technology integrates Guidance Line construction for enhanced gait efficiency while providing midfoot structural integrity. Guidance Line?Midsole Technology – Vertical flex groove decouples the tooling along the line of progression for enhanced gait efficiency. FluidRide Midsole – ASICS FluidRide midsole provides the ultimate combination of bounce back and cushioning properties with reduced weight and exceptional durability.