You could consider it tent insurance when all the good spots are taken at trail shelter.

Protect the floor of your Roadrunner 23 tent from The North Face with this durable Roadrunner 23 Footprint. It's made from a highly durable and waterproof 70-denier 190T nylon material that's coated with a 2000-mm. polyurethane finish. The compact and lightweight profile slips easily into a side pocket of your pack or you can fold the footprint down and stick it in the stuff sack for your Roadrunner 23 tent. It's also a great addition for fly-only pitching.