Size Adjustable - Medium best fits for 55-59CM 21.6"-23.2" 7 7/8-7 3/8
UPF 50+: the wide brim blocks most sun UV rays and provides excellent shade protect for face and neck protective
Ponytail Feature - pony slot is wide enough to conveniently pull your bun or high ponytail through.
The DETACHABLE CHIN STRAP - the neck cord can cover your hat from flying off in wind while travelling, fishing, boating or hiking.
Breathable & Ventilated & Fashionable Mesh Design - the mesh opening allows air flow well in, so it will not overheat in the summer. Meanwhile the overall design is stylish and unique enough to avoid any style homogenization.