Engineered Knit Upper - designed to deliver unbeatable breathability: Wide Toe Box - more flexibility in the forefoot allows your foot to move more fluidly: Air Cushioned Heel - creates a snug and locked-in fit with every stride: Innovative Cushioned Sole - offers exceptional comfort and ultra-responsive cushioning: Concave-Convex Rubber Outsole - delivers enhanced traction, stability, and durability.