The North Face FP Bastion 4 custom shaped ground sheet prolongs tent life and adds comfort to fly-only pitching use. Each FP (footprint) is cut to match the tent model’s floor shape so on rocky or muddy terrain, your tent floor is protected from abrasion and dirt. On wet, icy or cold ground a footprint adds another barrier against moisture and penetrating cold. If you are travelling light using the fly-only option of the Bastion 4 tent, the matching footprint is essential for added protection from the ground. Remember, it’s far easier to dry a footprint than a tent bottom. Pack up and go and dry the footprint on the trail during a sunny break. Protect and prolong the life of your tent with the FP Bastion 4 tent footprint.