It is an adjustable cap that is structured with a flat visor that has the capability to be curved.
The back panels are opened with a changeable plastic strap to suit your desired size.
These snapbacks come in two sizes, S/M and L/XL to fit nearly all heads.
Cleaning - Light Wizard recommend spot cleaning hats by hand for the most control and precision. They can also recommend using a gentle cleaner like dish soap free of any dyes, or a gentle garment cleaner. Using a soft tooth brush and a little water/cleaner should take care of most dirty hats. If deeper cleaning needs to be done please use best discretion and test clean in a small unnoticeable area.