RBX Active Hot & Cold Foot Roller Great for plantar fasciitis! You can freeze it and heat it. “Simply place the thermal foot massage roller in your freezer for 4-6 hours for cold therapy, and into hot tap water for 7-10 minutes for heat therapy. Thermal activated gel- use hot or cold. Shape contours to the arch of the foot. Ideal to reduce Plantar Fasciistis heel spurs. Textured surface promotes pain releave and circulation.”