Far Infrared rays muaj peev xwm nkag mus, refraction, hluav taws xob thiab kev xav. Tib neeg lub cev tuaj yeem nqus tau FIR vim nws qhov tob tob tob. Thaum FIR nkag mus rau ntawm daim tawv nqaij mus rau cov ntaub so ntswg subcutaneous, nws hloov los ntawm lub teeb lub zog mus rau lub zog cua sov.