I was happy to receive these wheel covers quickly. We just replaced the old R.V. tires with new ones and wanted to make certain that we can protect the new ones from the hot hot summer sun in our area. Living in hot temperatures does a 'number' on your R.V. tires The wheel covers are made of heavy vinyl and lined with a soft inner lining. They have elastic to hold them in place and are easy to put on; covering the tires well. They stay in place during windy days. Most of all I was surprised, when taking them off to use our R.V., the tires felt cool when the outside temperature was in the upper 90's. The price was also great!