This model is the number one choice of world-class and professional athletes and a favorite of people in rehabilitation. The AquaJogger Pro answers the needs of exercisers with low body fat or large, muscular frames (body fat floats; muscle sinks), physical conditions that require extra support, or for those who prefer a higher position in the water. The Pro is constructed with all the same quality materials as the AquaJogger Classic, yet 3/8" thicker for 30% more flotation. An illustrated, 24-page workout guide handbook and video are included. Adjustable up to a 48 inch waist.