The Wave is created with two distinct sides, a softer waved surface and a rigid flat side. A great manipulative play piece, the Wave can be used to create platforms, pathways, lounging areas for your Outdoor Classroom and walls. As an outdoor classroom system or indoor physical education product, the Snug manipulative play system is versatile as it allows for curricula based events or free play. The Wave body is low density polyethylene with a layer of flexible polyurethane foam and a flexible polyuria skin. Wave feet are made from black natural rubber.