Suede leather with cool flow through mesh, adjustable chin strap and leather hat band. Fully foldable, waterproof and super light weight. Sizes are:
S - 6 7/8 - 55 cm or 21.65 in
M - 7 1/8 - 57 cm or 22.44 in
L - 7 3/8 - 59 or 23.23 in
XL - 7 5/8 - 61 cm or 24 in
XXL - 7 7/8 - 62.5 cm or 24.6 in
Measure around the top of your head just above where your ears are attatched to your head.