The Eureka! Big Horn 3XDi full-size bathtub footprint has been designed to fit exactly under the Big Horn 3XDi tent. Using a footprint not only protects you from rocks, sharp twigs or pine needles, but also from mud and ground water. It will also minimize condensation caused by dampness in the ground of the vestibule. Can also be used as tarp keeping you out of the rain, wind and sunshine.