@GaijinMommy I noticed this yesterday. Within the space of 30 minutes near my station, I witnessed 4 people wearing some form of this contraption. I guess it’s the trend for this summer.
@Mulboyne I hope someone is getting rich because these tourists are ruining many areas of Tokyo + Kyoto. Good luck to any residents trying to make a smooth transition from Haneda to home or having a peaceful commute when these people are on board.