The Fire & Ice Therapy Deluxe Fit Training Massage Roller helps ease aching, sore and tender muscles. To instantly cool or heat your therapy ball, simply unscrew and fill it with iced cold or hot water. The revolutionary design maintains the temperature through a typical rolling session. 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 16" x 5.25".