Patagonia Bucket Hat

Patagonia.com says:
The Bucket Hat has a light and airy feel and casts 360-degrees of shade for hiking, fishing and beachside hanging. Made from soft, fast-drying 100% nylon, it features a water-shedding finish to repel rain and ocean spray. This sun hat has a time-tested design that includes a linear crown, crushable brim and ventilation holes to keep your noggin from hard-boiling. It also has 50+ UPF sun protection and rolls into its own inside pocket.