How to keep hair and body moisturized in wilderness?

What keeps hair and body hydrated and moisturized in the wild? What did the ancient civilizations use.

Specifically in harsh northern climates (think Alaska)How to keep hair and body moisturized in wilderness?
Animal fat
A lake....?



And Alaska is just like no one was really living there too far north like Indians and whatever, but ya they used hot springs from geysersHow to keep hair and body moisturized in wilderness?
Lard, which is rendered animal fat. Vegetable oil for more advanced civilizations.