Conforms to Your Body to Deliver Soothing Relief Soothes Shin Splints, Stress Fractures, Calf Muscle Strains & More. Chill it in the Fridge or Freezer for Analgesic Cold. Pop it in the Microwave for Penetrating Heat. Pack Holds its Therapeutic Temperature for a Full 20 Minutes. Get Fast, Effective Relief. Great After a Run & Anytime Shin Tenderness Sends You to the Bench You just finished your morning run & your shins are burning. Maybe it s those dreaded shin splints or a pulled a calf muscle. It could be a stress fracture, a tiny bone tear caused by overuse. These painf.