Nike Air Zoom Vapor X Knit Men's Tennis Shoes Black/Metallic Gold : Nike Zoom Vapor X Knit tennis shoes feature the latest technology made for the game of tennis. This model has reliable cushioning from the Nike Zoom Air unit, but with a modern twist. The knit upper provides lightweight, breathable support of the feet that allows for powerful, explosive movements between shots. Upper: Circular-knit material is breathable and lightweight. High-strength yarns provide support during movement on the court. Midsole: Soft foam midsole with Zoom Air unit in the heel offers low-profile responsive cushioning. A stretchy internal sleeve hugs the feet for a sock-like fit. Outsole: Rubber outsole with XDR compound on the heel and forefoot provides multi-surface traction and durability. A pattern of small triangles on the outsole adds durability to high wear areas.