The 4 brings back the tough, yet breathable mesh from the original version. The upper gets embellished with a Huarache-inspired strap and rubber-striped sidewall that envelops your heel to help brace you for movement in any direction. Nike Free technology in the forefoot creates flexibility for agility moves and sprints. Stretch around the ankle lets your foot move naturally as you burst, cut and brake. The wide heel creates a solid base for lifting. A softer foam core cushions your foot, while a firmer outer layer is durable and stable. Wide internal webbing distributes pressure around your midfoot for a comfortable, yet secure feel during sudden stops and quick cuts. Rubber tread in high-wear areas gives you durable traction. Rubberized logo at the tongue nods to the Nike Air Huarache of the early '90s.