It is the cuticle.
Try thinking that one through for yourself. Hair is on the outside of the body. Bones are inside the body. Kinda difficult to protect something if the protective layer is on he inside.
The layer of hard keratin that coats the hair is called the cuticle. It is the outermost layer of the hair shaft and serves as a protective barrier for the inner layers of the hair.
The outside layer of the hair strand is called the cuticle. It consists of overlapping scales that protect the inner layers of the hair shaft.
The cuticle is the colourless outside layer of the hair. It lets chemicals in and out of the hair, chemicals such as shampoo and colours.
The outside of the Dura Mater (a protective layer of the spinal cord and brain) of the spinal cord.
The cuticle of the hair is a protective layer,shielding it from temperature and humidity changes,as well as damage from rubbing and pulling
The innermost part of the hair (medulla) and the outside layer of the hair (cuticle) do not react with hair dye.
If you were outside the Earth's protective layer, the answer is yes.
Like the bottom of your feet, your palm is covered in a protective layer of skin, that have no pores.
cell membrane
Three major parts of hair are Cuticle, Cortex, and Medulla.
the inner layer ---> novanet