REI Sport Cap
Here's what other sites are saying:
The ventilated REI Sport cap will help girls avoid getting overheated so they can play longer and stay cool. Polyester/spandex blend is soft, lightweight and quick drying. Polyester inner headband wicks sweat away from forehead and dries quickly; polyester mesh side panels allow cross-ventilation. The REI Sport cap features a reflective logo on the back for enhanced visibility.