Wicking Stretch fit synthetic headband Pre-Curved bill Ventilation eyelets in crown M/L 20"- 22.5" 100% Polyester Imported Snap closure Snapback Closure Keeping dry is critical to keeping warm on the cold water. Our material's hydrophobic quality within the fibers of the material transport the sweat to drier areas-away from the skin to the exterior of the clothing where it can evaporate more efficiently Structured Front Mid Profile Full "flex stretch" fit