55% Polyester / 43% Cotton / 2% Spandex No Closure closure Ten-four, good buddy, I read you loud and clear. Patented, stretchable, polyester mesh on the back and sides keep you cool and comfortable on the road. Who said trucker caps can only be in adjustable sizes? The Flexfit Trucker Cap features elastic spandex woven throughout the cap. The result is a comfort fit design that hugs your head. Perfectly Curved Hat Brim – Designed with innovative brim technology, our trucker hats for women and men always maintain the ideal light-blocking brim curve. Silver undervisor. Hard buckram. 8 Rows of stitching on visor. Mid profile. Includes Sweat Liner – Each Hat Pros Flexfit cap includes a peel-and-stick sweat absorbing liner that helps wick away sweat, improve wearable performance, and keep your hat cleaner, longer.