These mistresses wanted to hire trampling pads. The human kind. They are all trampling central enthusiasts and they wanted to have a great time with it all of them at the same time. It had been long since they had done it all together at the same time. So they paid these guys so that they would endure their trampling and since the money was good, the guys agreed. But they worked for it as the mistresses used both bare feet and heels to do it.