You want performance fabrics, man. Look for terms like quick-dry, stretch, and UPF 50+. Materials like polyester blends, nylon, and sometimes recycled plastics are common. They should be lightweight, breathable, and resist holding a ton of water. Avoid cotton—it gets waterlogged, heavy, and takes forever to dry. The best hats feel almost like a second skin and you forget you’re wearing them until you realize you’re not sunburned.