Why does your hair loses its waterproofness when there is much hair?

Question

My English isn't very good.I hope that you all will understand my question.

Answer 1

Your scalp produces the same amount of oil.

More hair means more surface area.

More surface area means less oil.

Answer 2

frankly i do not understand your question,but how hair can not be unaffected by water,or do you mean humidity?

Answer 3

The modern fashion for using shampoo strips the hair of oil. The oil gave some degree of water resistance but that is lost.

To be natural you should only wash your hair with water but very few people could put up with that these days.

Answer 4

Real hair is not waterproof, plastic fake hair is waterproof.