The Gel-Kayano 24 offers more stability and comfort than ever: It provides unparalleled upper support with a redesigned jacquard mesh for enhanced fitting as well as with the new MetaClutch external heel-counter. Moreover, we refined the last to offer a better fit in the forefoot. Weight: 265 g Drop: 10 mm FLYTEFOAM A lighter weight midsole material, which provides exceptional lightness, cushioning and durability. TRUSSTIC A moulded component under the mid-foot area. Provides stability and, in combination with the contoured midsole, helps to control torsion. SPEVA A supreme midsole material that improves bounce-back characteristics and decreases midsole breakdown. SOLYTE MIDSOLE A lighter weight midsole material that Asics traditional EVA and SpEVA. Aslo features enhanced cushioning and durability. - See more at: http://www.runningshoesguru.com/2013/11/understanding-the-asics-running-shoes-lineup/#sthash.iSaS3fos.dpuf REARFOOT GEL The ASICS GEL system is based on a special kind of silicone that enables optimal shock absorption. Gel units are strategically placed in the midsole and designed to enable specific functions and positions. FOREFOOT GEL The ASICS GEL system is based on a special kind of silicone that enables optimal shock absorption. Gel units are strategically placed in the midsole and designed to enable specific functions and positions. I.G.S. The ASICS Impact Guidance System or I.G.S. is a technical shoe design philosophy that allows the athlete’s foot to perform in a more natural manner. ASICS high-tech I.G.S. shoes are constructed in a way that enhances natural “gait”. Guidance Line Vertical flex groove decouples the tooling along the line of progression for enhanced gait efficiency. Dynamic Duomax Next generation DuoMax system provides greater comfort and enhances gait efficiency. Removable sockliner Sockliner which can be removed to accommodate a medical orthotic. COMFORT DRY SOCKLINER This insole provides the optimum cushioning performance system that creates a cooler, drier, healthier shoe environment. X-40 Ortholite Sockliner Memory foam that provides enhanced bounce back and anti-microbial properties for a cooler, drier, healthier environment. AHAR+ This is a thinner and lighter version of ASICS High Abrasion Resistance rubber. It is placed on heavy contact areas of the outsole to reduce excessive wear. 3M SCOTCHLITE A special reflective material that enhances visibility when light is poor.