Nike Air Zoom Structure 24 Men's Running Shoe The durable rubber sole of this Nike Air Zoom Mens Running Shoe is built for mileage. Grooves in the forefoot to create flexibility, and vertical grooves down the side help create stability. The Mesh is engineered for durability with a softer and more durable lining around the heel and ankle helps keep socks from bunching up when you run. The use of a cushy tongue provides helps pad the laces.