Answer:
I can swim but never get wet. I can run but never get tired. I follow you everywhere but never say a word.
I come in different colors and shapes. Some parts of me are curvy some are straight. You can put me anywhere you like but there is only one right place for me.
The warmer I am the fresher I am.
I am longer than a decade and shorter than a millennium
I am a protector. I sit on a bridge. One person can see right through me, while others wonder what I hide. What am I?
What is always coming but never arrives?