Wordless Wednesday - What in the world are they doing?

The other day, Doc and I looked out the window and saw this . . .

It looks like they are parasailing on the ice. I've never seen anything like it before and it had me wondering a couple things -
1 - What are they wearing on their feet? Ice skates? Shoes? Boots?
2 - What happens if the wind takes them over a part of the ice that isn't solid?
3 - How do you stop?

If anyone has done this before and has any insight, please let me know. I'm thoroughly intrigued!