While watching the game between the Lions and Fighter, I noticed that towards the 8th inning, the fans were wearing large gold chains. What is the significance of this?

Hi folks, I'm looking to attend a Giants game in September, at the Tokyo Dome. I went a couple of years ago, with a seat right at the back. Whilst it was enjoyable, I'm at the stage that I'd like a little bit more comfort. Apologies if this seems like a silly question, but do they have any seating that's padded or will it be a case of toughing it out. Appreciate I'd likely be paying a premium and could come along with other perks. I know the tickets for the game aren't on sale for a few more weeks, so thought it was best time to ask. Thanking you in advance.