The Classic Series features two Hot Spring Spa models: Jetsetter and Sovereign. The difference between the standard and Classic models is that the Classic models feature an Endurol^® shell and a decorative trim. The Endurol shell is an innovative single, solid thermoplastic surface that provides a unique white finish that is contemporary and timeless. The decorative trim adds a tile-like design to the sleek lines and sweeping curves of each model.