The Nike Shox R4 has been released several times and is the only shoe in the original lineup to have been released several times.Nike Shox R4 dedicate Top plate distributes impact forces from the heel to the columns.Bottom plate produces a secure base for heel-to-toe transition.Transition wedge allows for a smooth ride.It has been called a lot of things: springy, resilient, bouncy.However to a runner,the Nike Shox Shoes means one thing: responsive cushioning.