Ahead of its time in '99. the innovative Air Max SNDR is back and louder than ever. From the secure fit around the heel to the zip-up shroud. this legendary sneaker continues to break the mold. It comes equipped with Max Air cushioning in the heel and Nike Air in the forefoot for exceptional bounce and comfort. Unzip the shroud to reveal 6453. a nod to the last 4 digits of Nike's office numbers around the world. which spell out N-I-K-E on the keypad.