Synthetic-and-mesh Imported Rubber sole Guidance Line Midsole Technology: Vertical flex groove decouples the tooling along the line of progression for enhanced gait efficiency. AHAR Outsole: Acronym for ASICS High Abrasion Rubber. Placed in critical areas of the outsole for exceptional durability. 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. FluidRide Midsole: ASICS FluidRide midsole provides the ultimate combination of bounce back and cushioning properties with reduced weight and exceptional durability. Ortholite X-40 Sockliner: This premium sockliner features higher rebound properties while providing excellent moisture management and a high-level of breathability (Ortholite is a registered trademark of O2 Partners LLC.)