The SpinalHealth JetPak is a deeply targeted massage for the inner spinal muscles that can tighten and cause back pain. This unique hydromassage is the perfect addition to your JetPak Therapy System if you occasionally feel spinal discomfort. Learn more: www.bullfrogspas.com/listings/custom/135/45/spinalhealth The JetPak Therapy System by Bullfrog Spas is the only modular hot tub jetting system that can be personalized specifically for you. You choose your jetting configuration, intensity, and the spa seat in which you prefer to place each JetPak. See more at: www.bullfrogspas.com/jetpaks