Description Were proud to say that the 17th GEL-KAYANO once again delivers an outstanding ride for the moderate over-pronator. Because this is an IGS development the transition through the 3 phases of gait is very smooth and efficient. The newest Mens GEL-KAYANO has an enhanced upper fit and improved forefoot comfort. Technical Specification IMPACT GUIDANCE SYSTEM (IGS) - ASICS Design Philosophy. Employs linked componentry that enhances the foots 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. X-40 COMFORDRY SOCKLINER - Provides cushioning performance and anti-microbial properties for a cooler drier healthier environment. FULL LENGTH GUIDANCE LINE - Vertical flex groove decouples the tooling along the line of progression for enhanced gait efficiency. SOLYTE MIDSOLE MATERIAL - A lighter weight midsole compound than ASICS standard EVA and SpEVA. Also features enhanced cushioning and durability. ASYMMETRICAL LACING DESIGN - An anatomically correct lacing environment that reduces potential for irritation and provides improved comfort and fit. SOFT TOP DUOMAX SUPPORT SYSTEM - A next generation DuoMax Support System which provides greater comfort and enhances gait effiency. PERSONAL HEEL FIT (PHF) - 2 layers of memory foam line the collar and mold to the athletes heel creating a personalized fit. BIOMORPHIC FIT UPPER - Stretch material strategically placed on the upper helps to reduce buckling and the potential for irritation. DISCRETE EYELET - Improves upper fit while reduces possible irritation. GENDER SPECIFIC SPACE TRUSSTIC SYSTEM - Recognizes the normal periodic changes in the shape of the womans arch and provides for the controlled deformation of the arch into the space within the system. PLUS3 - 3mm of additional height on womens models which helps relieve tension on the Achilles. GENDER SPECIFIC FOREFOOT CUSHIONING - A top layer of injected Solyte provides a cushioned platform feel in the forefoot. Womens models feature a lower density for improved cushioning and forefoot comfort.