The 14 Best Sun Hats of 2025。Circumference approximately 21.5” Pantropics Women\'s Wide Brim UPF Packable Panama Sun Hat Genuine panama hat woven of sustainably harvested straw of the toquilla palm Handwoven into a wide brim in a tight weave to provide top rated protection from the sun Diagonal open weave pattern around crown for cooling ventilation Although the hat is one size fits all, it fit can be adjusted with the chin strap Lace chin cord with adjustable bead keeps the hat secure, or lets it hang at the back of neck, leaving hands free Easy to clean or reshape