Yes, that says Mobile Shower. Not my first choice, but after a long day of walking it was heaven!
During closing ceremonies, the walkers who are breast cancer survivors walk onto the platform. And even though everyone is sore and exhausted and really rather not bend down to untie their laces, everyone takes off a sweaty shoe, holding it over their head as a toast. Doing this shows the survivors that the group walked these 60 miles for them. And they walked so that some day there will be a world without breast cancer.