What is a requirement for the ball used in matches?

A key requirement for the ball used in soccer matches is that it must be spherical. This shape is essential because it allows for consistent and predictable movement on the field, which is crucial for the game's integrity and fairness. A spherical ball rolls evenly and travels in a straight direction, providing players with the ability to accurately pass, shoot, and control the ball.

While there are other considerations regarding the ball, such as its weight, inflation, and material, the defining characteristic that is foundational to the game is its shape. The other options present characteristics that may pertain to the ball's performance or physical properties but do not address its required shape, which is fundamental to the sport.