A reversible pinnie means one jersey covers both sides of a scrimmage — flip it inside out and the team splits without anyone bringing a second shirt. For a coach running practice, that's the whole value.
The two-layer sports mesh is built to survive a season of practices rather than a handful, with breathability that holds up through drills in warm weather. Cut for youth players, so it fits properly rather than hanging like an adult jersey scaled down.
Lightweight enough to layer over a t-shirt in cooler weather. Machine washable and quick to dry between sessions.