▁hair ▁sh aft . ▁Class ical ▁af ro - text ured ▁hair ▁has ▁been ▁found ▁to ▁be ▁not ▁as ▁dens ely ▁concentr ated ▁on ▁the ▁scal p ▁as ▁other ▁fol lic al ▁types . ▁Specifically , ▁the ▁average ▁density ▁of ▁af ro - text ured ▁hair ▁was ▁found ▁to ▁be ▁approximately ▁ 1 9 0 ▁hair s ▁per ▁square ▁cent imeter . ▁This ▁was ▁significantly ▁lower ▁than ▁that ▁of ▁C au cas ian ▁hair , ▁which , ▁on ▁average , ▁has ▁approximately ▁ 2 2 7 ▁hair s ▁per ▁square ▁cent imeter . ▁ ▁L ouss our arn ▁found ▁that ▁af ro - text ured ▁hair ▁grows ▁at ▁an ▁average ▁rate ▁of ▁approximately ▁ 2 5 6   mic rom eters ▁per ▁day , ▁whereas ▁C au cas ian ▁hair ▁grows ▁at ▁approximately ▁ 3 9 6   mic rom eters ▁per ▁day . ▁In ▁addition , ▁due ▁to ▁a ▁phenomen on ▁called ▁' sh r ink age ', ▁af ro - text ured ▁hair ▁that ▁is ▁a ▁given ▁length ▁when ▁stretch ed ▁straight ▁can ▁appear ▁much ▁shorter ▁when ▁allowed ▁to ▁naturally ▁co il . ▁S hr ink age ▁is ▁most ▁evident ▁when ▁af ro - h air ▁is ▁( or ▁has ▁recently ▁been ) ▁wet . ▁The ▁more ▁co iled ▁the ▁hair ▁texture , ▁the ▁higher ▁its ▁shr ink age . ▁ ▁An ▁individual ▁hair ' s ▁shape ▁is ▁never ▁completely ▁circular . ▁The ▁cross - section ▁of ▁a ▁hair ▁is ▁an ▁el lipse , ▁which ▁can ▁tend ▁towards ▁a ▁circle ▁or