PELAGIC UPSWELL TUNA CLUBThe Upswell hat has an unstructured, mid crown, relaxed fit, constructed with a water resistant nylon that will provide days of comfort. Laser cut perforations on the back panels enhance air flow to keep your head cool and allows air in and out for a comfortable and dry fit. The traditional snapback and woven rope will keep you looking good on or off the water. Mid Crown Adjustable Back 5 Panel Construction Quick Dry Ultralight Fabric 4 Way Stretch