Ahead of its time in '99, the Air Max SNDR returns-and it still checks all the boxes. From the synthetic leather upper to the zipper closure, this innovative sneaker continues to break the mold. Unzip the shroud to reveal "6453," a nod to the last 4 numbers of Nike's office numbers around the world, which spell out N-I-K-E on the keypad. Benefits - Zipper closure hides traditional lacing for a sleek look while providing a secure fit. Max Air cushioning in the heel and Nike Air in the forefoot add exceptional bounce and comfort. Product Details - Foam midsole. Rubber outsole. Not intended for use as Personal Protective Equipment (PPE).