Hot And Cold Therapy Pack,Hot And Cold Therapy,Hot And Cold Pack 1.CE,SGS,MSDS,EN71,FDA 2.Non-toxic,non-caustic,reusable 3.Eco-friendly 4.OEM Function: The theoretical basis of cold compress: microcirculation vessels contract during the cold compress by means of the stimulation of coldness and the penetration of energy, influences the organism system, triggers the feedback reaction of nerves and body fluid, strengthens the metabolication, significantly activates the body defensive system and makes the antibody active. The series of functional responses improve the human body health condition as