The P-6 Trucker Hat has an organic cotton bill to provide some shade and polyester mesh on the back crown to keep you cool. Made for late nights, bad food and country music, this is Patagonia's classic road-tripping hat with lots of volume for messy hair and cool airflow. It has 100% organic cotton canvas fabric in front and 100% polyester mesh in back to keep you cool and ventilated. The retro, trucker-hat styling features a generous, shapeable bill and adjustable snaps at the back for a perfect fit. Crown and bill: 8.3-oz 100% organic cotton canvas. Back crown: 2.5-oz 100% polyester mesh.