The hat is hand-knitted from linen yarn with the addition of cotton and viscose. It is very convenient in the summer heat, as it instantly absorbs sweat and immediately evaporates it, that is, the head becomes cool. In the heat this is important)
The size of the cap is the circumference of the head. You can measure and sartorial soft centimeter, and any ribbon-thread. Just wrap it around your head and then measure the length using any ruler.