ALPS Mountaineering 3-Person Outfitter Tent Footprint - ALPS Mountaineering footprints are a great addition to any tent purchase. They are cut a little smaller than the dimension of the tent floor and have corner attachments, which help keep it in place. Simple, fast, and all at a great price. Use under an ALPS tent for extra protection Footprints are like "insurance" for your tent floor. If you happen to have debris puncture your tent floor, it's much easier and less expensive to just replace a footprint than your whole tent.