It is composed of three layers, fabric layer, gel layer, non-stick layer.
As for the gel layer, it contains hydrophilic macromolecule, can reduce the heat very quickly by absorbing heat through evaporation. It also contains the natural cool plant extraction (Menthol) that can be well penetrated into the skin, to enhance the effect of cooling. Doctor recommends it to be used for cold therapy and pain relief.

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