Successor to the GT-2000 3. Breathable mesh and synthetic upper materials. Lace-up closure. Discrete eyelets disburse lace tension for optimal comfort. Soft, plush tongue and collar. Heel Clutching Systemâ"¢ is made up of an exoskeletal heel counter that promotes an improved fit and increased support. ComforDryâ"¢ sockliner offers antimicrobial properties for a drier, healthier environment. I.G.S® (Impact Guidance System) features linked components to enhance the foot's natural gait from heel strike through toe-off. Dynamic DuoMax® System increases stability and support with reduced weight and enhanced platform comfort. Rearfoot & forefoot GEL® cushioning systems work together to better attenuate impacting shock and allow the foot to move fluidly throughout the gait cycle. FluidRideâ"¢ midsole technology delivers a supreme combination of energy return and cushioning with reduced weight and lasting durability. Midsole Height: Heel/Toe: 21 mm/11 mm Heel-To-Toe: 10 mm AHAR® is strategically placed throughout high-wear areas of the outsole. Guidance Line® technology employs a vertical flex groove that decouples the tooling along the line of progression for maximum stride efficiency. Guidance Trusstic System® integrates Guidance Line construction to enhance gait efficiency while promoting mid-foot structural integrity. Imported.