*UPDATED* I.G.S - ASICS Design Philosophy employs linked components that enhances the foot"s natural gait from heel strike to toe-off for improved running efficiency and an improved ride underfoot. * *UPDATED* Weight - 310g provides a lighter shoe than its predecessor for improved running efficiency and feel. * *UPDATED* Full-length Guidance Line - Vertical flex groove decouples the tooling along the line of progression for enhanced gait efficiency. * *UPDATED* Greater Visible Forefoot GEL - This model has more forefoot GEL than its predecessor. The ASICS GEL system is based on a special kind of silicon that enables optimal shock absorption. GEL units are strategically placed in the midsole and designed to enable specific functions and positions. * *UPDATED* Guidance Trusstic - This trusstic system integrates Guidance Line construction for enhanced gait efficiency while providing midfoot structural integrity for a more consistent and directional ride underfoot.