Flap sun hat suitable for most of the small head ladies’and girls’ best fits for 55-57cm, 7/8- 7 1/8, 21.6-22.5inch,with an adjustable bow at back and hole for ponytail. 4.7inch Wide brim in plastic & flap provides an enough shade and uv sun protection to cover your face & neck from sunshine especially in summer without blocking your view.SPF 50: this sun hat has passed UPF 50 test, it could block most sun UV rays. Lightweight & breathable. Good perforamnce for travel and outdoor activities such as hiking,fishing,golf,boating……;regardless of where you wear it – beach,cruise ship, garden…… Packable & rollable, soft materials helping this hat easy to take and still hold its shape.But Attention for the plastic brim, don’t fold it! Detachable & adjustable chin cord keeps this sunblock hat secure for windy days.