Made of Polyester. It's more than just a heating pad, it becomes an electric hand warmer; The heat helps relieve muscle spasms, stiffness and pain, relaxes and warms your body. The heating belt is designed with skin-friendly crystal velvet, which is not only portable but also breathable. There are velcro on both sides of the belt, which can be adjusted to adapt to different body parts, such as shoulders, waist, abdomen, joints and legs

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