The Best FIR Saunas To Get Rid of Pain And Stiffness. Far infrared (FIR) is the longest wavelength which penetrates the fat cells causing vasodilation, where the fat cells vibrate to expel toxins. Far infrared saunas provide benefits by heating the body directly rather than heating the air around your body.

An infrared sauna is a type of sauna that uses light to create heat. Far infrared sauna therapy may lower blood pressure.

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