The Beach cushions are made from either Olefin (grey & taupe) or Polyester (jade, ochre, blue) and the fabric has a silicone backing on which stops water penetrating through the fabric onto the filling. The filling is also encased with a waterproof interliner. They have been manufactured in a way that means you can leave them out all summer and they can withstand light showers. It is important that the cushions are covered with our FC38 waterproof Beach protective covers during heavy rainfall. We recommend storing them in a dry place over winter. It is important to maintain your cushions correctly and dry them out if the insides do get wet. Remove the cover from the filling and dry out completely before using again.