Our main breathing apparatus when on the surface of the pool these allow us to breath while still watching the play of the game. They come in various shapes / sizes and most players will shorten their snorkel to allow for easier breathing. Some players also color them with their country colors or just to be different so they can be spotted easily in the water.
Typically used in skin / scuba diving these come in various shapes and sizes. Players choose a particular mask for maximum visibility while offering good comfort in the pool.