Help east sore, tired, and aching muscles with this the Fire & Ice Therapy Fit Training Massage Ball. To instantly cool or heat your therapy ball, simply fill it with iced cold or hot water. Can be used to ease aching calves, quadriceps, glutes, hamstrings, shoulders, lower back, and even your feet. Also great to ease foot soreness after a long day of standing. Measures approximately 4"x4" and is the perfect size for all hands. Comes packaged inside a high quality box.