system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is water not a moisturiser?

When I have a shower my skin feels all ashy and I need to put moisturiser on it. Why does water seem to take the moisture out?
gpt
Because water is not oil. Oil keeps moisture inside, while water removes the oil.
Therefore, after washing, your skin gets dry due to the moisture not being held in by oil. More true when soaps remove the oils, you can really feel the dryness.