Exped Footprints protect your tent floor against general wear and rocky ground.
Exped says: Footprints for ground protection beneath tents. Available for all Exped tent models a footprint protects a tent floor from abrasion, dirt and humidity. Shaped like, but 10 cm smaller than, the tent floor to prevent rain from collecting between footprint and tent floor. Also covers the vestibule floor space to protect the vestibule from dirt and humidity.