Providing the Best Value and Selection of Quality Spa Covers.
Proline offers 5 different cover densities to choose from, Value, Premium R15.5, Premium R16.5, Premium R17.5 and The Elite cover with all the extras! . Proline Spa Covers are rated based on the insulation value (R-Value) of the Expanded Polystyrene foam, rather than 1 lb., 2 lb. foam, etc.