This Kampa Cross T/G Footprint is designed to fit under the sewn-in groundsheet area of your tent, to protect it from damage by stones. It will help in keeping the base of your tent clean, and will add a layer of insulation from the ground to keep you snug along with your sleeping bags and tent carpet.
If you get to a pitch that is tight on space, the footprint is also useful, in that when you lay it down you can work out the best place to erect your tent. In our professional opinion, buying a footprint, although not essential, is strongly recommended to help look after your new tent and maintain its condition for as long as possible.