With Nike Zoom Air and a Dynamic Fit system, the NikeCourt Air Zoom Vapor X provides ultimate control on hard courts. Secure Fit The Dynamic Fit system wraps your foot from the bottom of the arch up to the laces for a glove-like fit. Responsive Cushioning A Zoom Air unit in the heel offers low-profile, resilient cushioning from swing to swing. Quick Stability The full-length TPU foot frame wraps up the outside of your foot for added stability on every turn and swing.