All spas need to have some type of cladding to enclose the spa shell, plumbing and equipment. The material should be durable and weather well.
Composite: Composite cladding has become quite popular and is available to different colors to match almost any back yard. Composite material is weather proof and requires very little maintenance.
Wood: The most durable wood for spa cladding is western red cedar and can be stained in different colors. Cedar requires regular maintenance.