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.
cuticle
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 cuticle is the colourless outside layer of the hair. It lets chemicals in and out of the hair, chemicals such as shampoo and colours.
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.
The innermost part of the hair (medulla) and the outside layer of the hair (cuticle) do not react with hair dye.
The ozone forms a protective layer. It is present as ozone layer.
The ozone layer contains the protective gas.
Chlorofluorocarbons damage the protective ozone layer.
The protective layer is ozone layer. The protection is from UV.