Hello everyone!

New to Hertz and I have a question regarding the upgrades. I recently status matched from National and considering using PC for my next rental. I am looking at videos and I see at airports that have UC there are sections for Premium Upgrades and Ultimate Series. Are they different and if so do they both cost $25/day to upgrade to a car parked there?

Sorry for the confusion I am used to National where they have the premier selection for upgrades and Hertz sounds more confusing. Thanks!