Water Tubes Hole Fixing.?

Okay. Hi! Another question. alright ny nephews were sledding down the stairs in front of my house. They bumped into the pole on my fence and all three of them made a hole in their tubes. The tubes are regular size and you would usually use them for the pool. My bright nephews decided to use them for snow but whatever. So the point is, that I need to know if there is a way to fix them not using big elaborate ways. Thanks