The No Zone hat runs small so Dakine recommends you go a size up.
Dakine No Zone Hat
A FLOATING SUN HAT FOR CREATING YOUR OWN SHADE
Flat water or surf, you need to create your own shade on the water. Dakine's wide-brim No Zone Hat delivers sun coverage in a ventilated water-friendly design. An adjustable chinstrap defies the wind, while foam brim inserts keep it afloat should it get away.
Materials
Black: 100% Nylon
Prints: 100% Polyester
Dimensions
S/M (7 1/8") | 57cm (22 1/4") circumference
L/XL (7 3/8") | 59cm (23") circumference
XXL (7 3/4") | 61cm (24") circumference
Features
Floating hat designed for water use
UPF 50+
Front and rear inserts in brim to hold shape in wind or when wet