Our top-selling trucker hat style! The Running Trucker is a nod to our world-famous Technical Trucker® but delivers performance upgrades for those high-intensity workouts. Soft, laser cut side and back panels provide excellent breathability and a more tailored fit, while the 5-paneled construction gives that classic, casual look. This cap is the perfect summer accessory, from dawn's early light to twilight's last gleaming. Size: OSFM View Size Chart