The lightweight Gel Kayano offers a perfect mix of ultimate structured cushioning as well as a moderate level of support making it excellent for runners with mild Pronation-those who have a predisposed inward rolling motion as the foot progresses toward toe off and more severe Pronation-those who have an exaggerated inward roll and poor shock attenuation. Discrete Rearfoot and Forefoot Gel: Attenuates shock during impact phase and allows for a smooth transition to midstance, and shock during impact and toe off phases, and allows movement in multiple planes as the foot transitions through the gait cycle.Clutch Counter: Exoskeletal heel counter provides improved support and creates improved heel fitting environment.ComforDry Sockliner: Removable sockliner that provides cushioning performance and anti microbial properties for a cooler, dryer and healthier environment.Discrete Eyelets: Independently placed eyelets disperse lace tension, creating a customized fit environment and enhanced upper comfort.Dynamic Duomax: Next generation Duomax sysem provides greater comfort and enhances gait efficiency.3M Reflective: Stay safe reflective properties for night or dusk running.AHAR: Acronym for Asics High Abrasion Rubber. Placed in critical areas of the outsole for exceptional durability.SpEVA 55 Lasting:Fluid Fit: Asics Fluidfit technology combines a technical mesh that stretches in multiple directions with other stretch materials to create a glove like fit.Fluidride: The latest evolution in Asics midsole technology. Fluidride provides the ultimate in bounce back and cushioning characteristics while being lightweight.Guidance Line: Vertical flex groove decouples the tooling along the line of progression for enhanced gait efficiency.Guidance trusstic: Reduces the weight of the sole unit while retaining the structural integrity of the shoes.Impact Guidance System: The Asics IGS is a technical shoe design philosophy that allows the athletes foot to perform in a more natural manner. Asics high tech IGS shoes are constructed in a way that enhances natural gait.Light AHAR Sponge: A blown Asics High Abrasion Rubber outsole material with high abrasion resistant qualities for added durability, combined with a comfortable, cushioned ride.