What type of insulation is this?

This is the second time this year I have came across a house with this type of insulation found in the attic knee-walls. After searching, it appears to either be horse hair or redwood mulch insulation, but from what I could tell, I would say its horse hair. Your thoughts.

Looks like wood chips extremely flammable did you test some .

Google horse hair, insulation.

May be it is for keeping the inner temperature of the house stable. I know this insulation and there are many people who are using it. but now, big companies are entered in the market and provide their best home insulations after this. And its value is decreasing day b day.

Hi friend. I think he is asking about the type of insulation not its importance or popularity. According to me it is horse hair.