This Eureka 3 Extra Large Shaped ground cloth is pre cut to 12' 9 x 11' 9 it fits large 1 2 room family tents. Eureka pre cut ground cloths are made from a sturdy, durable 6 mil polyethylene without grommets. Ground cloths protect your floor from rips, holes and abrasions. They also add another layer of waterproofing to the floor and it keeps the bottom of the floor relatively clean from mud, dirt and debris. Ground cloths should be smaller than the tent floor by at least 2 4 inches. If the ground cloth sticks out it can collect water between the ground cloth and the tent floor which could lead to water in the tent. Wt. 2 lbs. 10.5 oz. Protect your tent floor from rips, abrasions and holes Helps keep your tent floor clean Economical protection Weight Wt. 2 lbs. 10.5 oz. 6 mil polyethylene Extra layer of protection from water.