I.G.S. - Impact Guidance System - Asics design philosophy, enhances the foot's natural gait from heel strike to toe-off. Rearfoot 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. Full length Guidance Line - Vertical flex groove decouples the tooling along the line of progression for enhanced gait efficiency. Solyte - lighter weight midsole compound which features enhanced cushioning and durability. Guidance Trusstic - Reduces the weight of the shoe while retaining structural integrity. Integrates guidance line construction for enhanced gait efficiency. AHAR+ Outsole - Thinner and lighter version of ASICS High Abrasion Resistant Rubber. Placed on heavy contact areas to reduce excessive wear. ComforDry sockliner - cushioning performance and anti-microbial properties for a cooler, drier, healthier environment. Discreet eyelet for improved upper fit with reduced irritation.