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The purpose of this paper was to design the sizing system of the head gears, which would be a guide of men for selecting their head gears of suitable size. This study was carried out on 214 men and was done by cluster analysis with two variables(head circumference and bitragus to vertex arc length). The results were as follows : First, almost of measurements were larger men's value than women's it. Second, the suitable number of size was found that 5 sizes were proper by cluster analysis with two variables. After the design of sizing system, in order to decide whether it is proper or not, the cover ratio was investigated. Third, in the cover ratio, the 5 sizes was the highest in all of them.