A Water Shedding Cushion (or RWSC) is an inflatable cushion that lifts the surface of the cover slightly. This makes it easy for rainwater to run off your cover. The RWSC also prevents large puddles of water from remaining on the cover. It also improves the circulation of air under the cover. The cushion's instructions for use are printed on the RWSCs themselves. They do not always have to be fully inflated, as this can vary from one piece of furniture to another. Inflate the cushion to the desired thickness or height, which is right for your furniture.