Who doesn't love a self-realizing accessory? If it isn't Good Hat Time before you don this stylish chapeau, it certainly will be once you have.
 
One size fits most -- because anyone claiming otherwise has not tried buying a hat for Lars.
 
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Here is what the manufacturer has to say:
 
A 100% polyester front and 100% nylon mesh weave back make these hats super durable through regular wear and tear. They come in one size with an adjustable plastic snap closure: 22.8" (58cm). The cap's front has six rows of visor stitching. 
Material: 100% polyester foam front with 100% nylon mesh weave back
One size fits most (22.8"/58cm)
Four color combinations to pick from
Adjustable plastic snap closure
Six row stitching on visor
 
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Here is sizing information from the manufacturer:
 
 
One size
Circumreference, in
22.80
Crown height, in
3.50
Bill length, in
3.03
 
(Note from TTG: We realize that says "Circumreference" -- it was just so delightful we couldn't bear to change it.)