Answer:
The more there is the less you see.
What goes through a door but never goes in and never comes out?
I am a kind of coat that can only be put on when wet.
What has feet and legs, and nothing else?
I can be winding and I can be straight. I can be smooth and I can be rough. Sometimes both. I start out black but fade to brown. My favorite colors are yellow and white and I love stripes and dashed lines.
I lose my head in the morning and regain back it at night.