With Omni tennis trainers, or outdoor tennis shoes, you have the benefit of multi-functional uses as they are suitable for all outdoor games. Serve-and-volley players always perform well with omni shoes. This has to do with the speed of the ball on the surface. The outsoles of omni shoes are softer because the surface is not as hard on shoes therefore this allows you to gain maximum speed. Additionally, this means that the shoes will be less easily damaged.