again, follow these^
I hate to join in on this thread because this is the millionth time it was asked...but,  I will say that some people can look super good in park w/o poles.  IMO you have to be super steezy to pull it off and not look gay, but if you are not filming and prefer it for learning, then go without, no need to ask permission!!  I may spend a bit more time next year w/o poles since I will actually be spending a good amount of time in park and it can help progressing.
  Lastly, MUCH, MUCH WORSE than no poles is poles that never touch the ground.  If you use those, go give them to a 4 year old on the bunny slope!  It's like you don't know how to use poles, but want to have something worthless in your hand because you are embarresed that you don't want to use poles.