The primary casual factor cannot be indicated by the distribution of hair trait under the asymmetrical distribution of trait. So the result of human aesthetic preferences arbitrary was simply the hair texture specifically.  Where as in case of women’s hair, it may be hidden under head scarves and where as in case in modern era required for modesty constraints and other religious factors use wigs, and other head coverings like scarves to protect the hairs. This can be taken as a constraint in modern era but in case of old age, it was a strain. And in some part of religious people, they generally or purposely keep their hair uncut and kept in inside a bun like structure in the head. Men follow this rule and above the bun they keep a turban to hide the bun and hair. The purpose or the state of having a less than normal amount of hair which is present on any where upon the parts of human body and also in the head is called as hypotrichosis. But where as in accordance with the hair follicle structure, the root sheaths function is to protect the hair fibre as it develops along with the hairs.