The Nova Duo Mat combines the soft cushion of polyfoam with the firm no bottoming trait of polyethylene! Perfect for young tumblers in their beginner or intermediate stages. The Expando Nova Duo Mat offers a 1in layer of polyfoam which provides the softness for younger, lightweight children, while a firmer 1 3/8in polyethylene layer keeps the mat from bottoming out during more extensive use. Nylon reinforced tough 18 oz. vinyl cover uses double reinforced, nylon stitched inverted seams to create a smooth working surface. Each mat has 2ft panels and 2ft folds and are lightweight for easy handling and storage.