Cold and hot pack therapy, using phase change materials’ high latent heat character, Phase change physiotherapy blanket is made to make cold or hot treatment to specific position when needed. Before use, the pack can be warmed up in microwave or Freeze it in the fridge. Because of high latent, it can be last for long time with high or low temperature, to achieve better effect. Hot or Cold therapy can effectively relieve pain, eliminate muscle acid bilges, relieve muscle tension, eliminate swelling, etc.