Imported Rubber sole Shaft measures approximately low-top from arch U4ic Midsole: Delivers optimal shock reduction, durability, and a superior ride.? Innovatively light, well cushioned, responsive, and resilient. U4icX Midsole: A lighter, more cushioned iteration of U4ic, delivering a softer underfoot feeling for a smooth transition. Found in the Wave Inspire, Wave Rider, and Wave Prophecy. U4icX Strobel Lasting Board: Ensures a comfortable underfoot feel. X10 Outsole: Durable carbon rubber that allows for longer wear. WAVEKNIT upper construction provides a comfortable fit with natural movement.