Authentic Greek Fisherman's Cap - Wool - Black - Size 57 - (7 1/8) with Authenticity Certificate About this item This authentic Greek Fisherman cap is made in Athens, Greece. It is made of 85% Wool/15% Nylon and will keep your head warm during the year's cooler months. Our Greek Fisherman Caps are fitted and not adjustable, so use our head sizing chart in the included pictures to the left, to determine the correct hat size. Hat Sizing and How to Measure Your Head To calculate your cap size, a head circumference measurement should be taken in inches. This is best achieved by passing a cloth tape measure around the head. Alternatively, a piece of string may be used and measured against a ruler or tape measure. Take a measuring tape or piece of string and place it around the circumference of the head, slightly above the ears.