The exterior of a tennis ball is characterized by a fibrous, felt-like covering. This layer is not merely aesthetic; it is a crucial component of the ball’s design, influencing its aerodynamic properties and interaction with the racket and court surface.
The presence of this covering significantly impacts the ball’s flight trajectory and speed. It increases air resistance, allowing players to impart spin and control the ball’s movement more effectively. Historically, different materials and weaving patterns have been tested and refined to optimize these characteristics for competitive play.