The forefoot is more flexible because we shrank the Air Zoom unit and placed it where your foot feels the most impact. You still get responsive cushioning at the highest push-off point of your forefoot, but now there's more flex.Stick and CutThe outsole is made of a new rubber compound that's lighter than Vapors of the past. It allows you to decelerate, plant and back into position without feeling like you're rounding off your cuts.Improved FeelWe kept the same midsole foam and outsole pattern you loved on the Vapor 2 and improved the secure feel around the midfoot and heel for sharper cuts.Deeper FlexThe supportive forefoot piece has a deeper flex notch to improve flexibility.Enhanced FitA full midfoot fit band helps you pull the laces tighter to enhance the fit and enable faster cuts. More Details Designed for wear on hard court surfacesDurable, breathable mesh on upperRubber toe tip