Different layers of a water polo ball?

Answer 1

A Water Polo ball has two main layers. The inner layer is an inflatable bladder that holds air and basic structure. The outer layer is a rubber fabric that allows better grip on a ball and prevents the ball from absorbing water during a game. When a ball absorbs water it becomes heavy and hard to control.

Answer 2

Wow, like it's not obvious. All the ball is made out of is rubber and air that you breathe. :]