Aussie Style Wide Brimmed Cool Mesh Breathable Hat Mesh air flow material for maximum cooling Protects ears, neck, and face from the Sun Terry headband on the inside for an extra comfortable and Plush feeling Lightweight durable construction makes this a great hat for travel, watching sports, playing tennis, hiking, or anytime you need to protect your entire head, neck, and face from the sun Sizes based on diameter of head: small (23-in.), medium (23.5-In.), large (23.75-In.), X-Large (24-in.)