MTB seatpost

I have a Bontrager Sport seatpost on my MTB. I've been looking it over, and can't figure this out: does it tilt front and back? I just picked up a new saddle (Selle San Marco Era Pro Ti), and it's tilting back slightly. Very annoying!

If the post doesn't tilt, any suggestions on one that does? And, how do you size them?

Thanks!