Outdoor Research Sunbriolet Hat

Now bluesign approved, the Sunbriolet Hat offers UPF 50+ protection with superior breathability. The mesh-lined crown and side vents keep your head cool, and the quick dry moisture wicking headband keeps the sweat out of your eyes. Secure the hat with the cinch cord at the back and the detachable chin cord. The varied brim is wider at the back to protect the neck from the sun, and a narrower brim keeps the face and eyes protected without blocking the view. 

To size, measure around your head where the hat would fit comfortably.

Small: 53.5-55 cm
Medium: 55-57 cm 
Large: 57-59 cm 
XL: 59-61 cm