AureliusHair probably had an important function at some point in human evolution but now it's mostly cosmetic
MrJameGumbAs a bald man I can tell you that the hair on your head does A LOT to keep you warm. I have to wear hats all year round except in the hottest part of summer.
RubberDuckAnd in the hottest day you run higher risk of sunburn as the hair is not there to protect :(
explodicleThat’s part of why I prefer spray-on sunscreen.