Seamless, breathable mesh upper for a cool, comfortable fit. ComforDry Sockliner provides extra cushioning and anti-odor properties. Heel and forefoot GEL Cushioning Systems mimic the foot's natural tissue, absorbing and dispersing shock on impact. FluidRide midsole combines durable cushioning and bounce back for a comfortable run, mile after mile. Impact Guidance System's linked components and Guidance Line vertical flex groove work together to create a smoother, more efficient running stride. Solid rubber outsole for durable traction on any surface. Wt. 8.5 oz.