ASICS GT-2000 4 running shoes offer the kind of structured cushioning that neutral runners to overpronators are seeking to enhance the efficiency of every run. In this version, the GEL® cushioning systems are even more adaptive than before, providing assistance with greater support. The trails will be no match for these flexible and durable shoes. Enjoy the innovative ride.Upper: Heel Clutching System™ is an exoskeletal heel counter that provides improved support and creates an improved heel fitting environment. Padded tongue and heel collar enhance comfort. Discrete Eyelets disperse lace tension, creating a customized fit environment and enhanced upper comfort.Midsole: Gender Specific Cushioning features a lower-density top layer in the midsole, allowing female athletes to better enjoy the benefits of midsole compression. Impact Guidance System (I.G.S®) employs linked componentry to enhance the foot's natural gait from heel strike to toe-off. FluidRide™ provides the ultimate combination of bounce back and cushioning properties with reduces weight and exceptional durability. Dynamic DuoMax® Support System enhances stability and support, with reduced weight and increased platform comfort. Rearfoot and Forefoot GEL® Cushioning Systems attenuate shock during impact phase and toe-off phases, and allows movement on multiple plans at the foot transitions through the gait cycle. Guidance Trusstic System® integrates Trusstic System® and Guidance Line® construction for enhanced gait efficiency while providing midfoot structural integrity. ComforDry™ Sockliner provides cushioning performance and anti-microbial properties for a cooler, drier, healthier environment.Outsole: AHAR® ASICS High Abrasion Rubber placed in critical areas of the outsole delivers exceptional durability. Guidance Line® vertical flex groove decouples the tooling along the line of progression for enhanced gait efficiency.