The Tandem Footprint from Gazelle is made from a durable 300 denier Oxford weave polyester and rated waterproof up to a 3000MM HH rating. The size of the Tandem Footprint was designed perfectly match the size and shape of your Tandem Portable Gazebo adding another level of waterproof protection. It works great as a floor or a barrier to keep bugs out when in use on a deck.