FluidFit stretch mesh upper provides a snug fit that moves with the foot. Heel Clutching System holds the heel securely in place, eliminating wiggle room for injury. ComforDry X-40 sockliner wicks away sweat and prevents the growth of odor-causing bacteria, keeping feet fresh through your toughest workouts. Heel and forefoot GEL Cushioning Systems for absorb the repeated force of impact for a smooth, more comfortable run. FlyteFoam midsole technology is durable and lightweight, providing a fast feel that's tough enough to go the extra mile. Fluidride midsole for lightweight, responsive cushioning that returns energy with every step. Guidance Trusstic System and Guidance Line's deep vertical flex groove encourage a more natural and flexible running stride. Solid rubber outsole for durable traction on any surface.