Stays Cold Over 1 Hour Relax Muscles Cool off! Relieve Tension Increase Serenity Ease Aches & Pains Roller Ice TM Massage Ball rolls freely in all directions for a great massage. One side provides effective deep muscle massage, the other side is great for broader surface massage.  Both ends add soothing, effective cold therapy.  Use for neck, head, back, carpal tunnel, migraines, hands, feet, knees, elbows, and much more!