Far Infrared Rays (FIR), a part of natural sunlight having the longest wavelength, cannot be seen with the naked eye.
远红外线(区)，自然有阳光的波长最长的一部分，不能用肉眼看到。
Among the sun's rays, the far infrared ray can go deepest into skin and subcutaneous tissues.
远红外线是在所有太阳光中最能够深入皮肤和皮下组织的一种射线。
It's a compound of natural polar mineral material and multifunctional ceramic material can be more effective with far infrared rays that was eradiated by natural polar mineral.
它是由多种天然极性矿物材料和多功能健康材料复合而成，并添加稀土元素，与天然矿物材料辐射的远红外线性能协同增强。
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