The physiological effects of heat and massage help treat many types of soft tissue injuries and other conditions such as orthopedic, rheumatic, and neurologic disorders. Hydromassage feels like a hot tub on your back, neck and shoulders but you never get wet. You remain completely clothed as you lay on a water filled mattress and relax as a series of hydro-jets massage away aches and pains. Heat and massage combine to produce the therapeutic effects.