The GPIW™ Biner Interstate Hat is our homage to the tool that’s kept us hanging in there since 1973. The hat features our highest crown with a broad, seamless polyester foam front and cord at bottom front panel. 5-panel design has a mesh-polyester back to circulate airflow. The flat brim is made of 100% organic cotton canvas, with a moisture-wicking COOLMAX® headband to keep you comfortable and dry. Adjustable tabs in back secure the fit.