Back when I used to carry one, I had a Tyvek footprint that was quite a bit smaller than the tent floor.

This is off topic so please feel free to ignore: But I don't use one anymore and life is better. I'm better at site selection, and there's one less wet dirty thing to pack up. The guy who makes my tent, Henry Shires, also repairs them and he says he virtually never gets a tent back for a floor repair. His website mentions that footprints are optional.