SPA Feature is a term used to describe the various amenities offered at spas. These amenities typically include a SAUNA, hot tub, and steam room. A SAUNA is a small room or house designed as a place to experience dry or wet heat sessions. A hot tub is a large tub or small pool of heated water used for relaxation or hydrotherapy. A steam room is an enclosed area where steam is generated from a humidifier and dispersed around the room, creating a warm and moist atmosphere.