Brim widths range from about 3 to 3.7 inches, and crown heights are typically around 4.5 to 5 inches.
They advertise UPF 50+ sun protection, and some product descriptions state they block about 98% of UVA/UVB rays for full coverage.
They use ventilated mesh panels or mesh vents, quick-dry polyester, and moisture-wicking sweatbands to increase airflow and help keep your head dry.
Common features include chin straps (drawstring or cord) plus adjustable elastic or rear head straps; adjustable sizing helps keep the hat secure in wind.
Care instructions consistently recommend hand washing with mild detergent and air drying—typically line or hang to dry.
Most are sold as one-size-fits-most and list adjustable fits for head circumferences roughly 22 to 24 inches.