The DeepRelief JetPak provides the most powerfull and intense massage sensations in the JetPak Therapy System lineup. Each powerful jet targets a specific muscular region of the back to provide a penetrating massage that powers away stress and tension. For those that prefer a more mild massage, the intensity can be adjusted at any time. Learn more: www.bullfrogspas.com/listings/custom/128/45/deeprelief 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