system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is feeling in your face/legs diminished when you shave them?
gpt
Hairs are part of your sensory system. When a hair is moved, you can feel it, due to nerves in the follicle.  For proof, just try running your hand through your hair. Although hair itself is just nonliving protein and has no nervous system of its own, you can still feel a sensation on your head. This is because the movement of the hair pulls at the underlying skin slightly, and you do have nerves there that can detect that slight pulling.

When hair is removed, that whole process isn't possible. You can still feel pressure and friction on the skin, but that sensitive pulling sensation from the hair is lost.