The double-coated footprint California Highway by Outwell is tailored to all bus tents bearing the same name. Thus, the tent completely covers the footprint and you do not run the risk of having any rainwater between the footprint and your tent's floor.
The footprint serves as guarding layer to keep your tent's floor free from dirt and abrasion. At low temperatures, it is also a welcome insulation. For a smooth footprint, the footprint comes with pegs to fix it to the ground.