Fans of the GEL-Cumulus series will love the technical updates that improve both upper fit and its exceptionally cushioned ride. Its surprisingly stable platform is suitable for underpronators to mild overpronators. Features an Impact Guidance System (I.G.S.) that follows the ASICS design philosophy that employs linked componentry to enhance the foot’s natural gait from heel strike to toe-off, a P.H.F. (Personal Heel Fit) with 2 layers of memory foam to line the collar and mold to the athlete’s heel, creating a personalized fit, a Guidance Line vertical flex groove that decouples the tooling along the line of progression for enhanced gait efficiency and a ComforDry Sockliner that provides cushioning performance and anti-odor properties for a cooler, drier, healthier environment. This Trusstic System integrates Guidance Line construction for enhanced gait efficiency while providing midfoot structural integrity and the Solyte lighter weight midsole compound than ASICS’ standard EVA and SpEVA.