OTTO Mesh Back Trucker Hat: OTTO's World Famous Foam Trucker Hats Front: 100% Polyester | Back: 100% Polyester Color-Matching Rope across the front panel delicately accents the hat Air Mesh Back offers enhanced breathability and airflow Premium Durable Plastic Snap Closure for easy adjustment and a secure fit Matching Fabric Undervisor and Sweatband adds a stylish finish and cohesive look Soft Terry Cloth Sweatband for Maximum Comfort with Moisture Wicking Designed for comfort, durability, and everyday wear.