The Arc’teryx Bird Trucker Curved Cap is ready for both mountain adventures & city streets. It has a curved brim & classic look, which is combined with light, breathable performance materials for the ultimate blend of style & functionality. The monofilament mesh in the back is breathable, while the polyester Circuit material up front dries quickly, & the Spacermesh band helps manage moisture. Bonded polyester ribs help this cap hold its shape which, combined with the adjustable snap back, creates a perfect fit.