... .made by natural color cotton 2.release far infrared, ions 3.antibacteria, deordorizing 4.improve immunity ... -fatigue Features: “three natural energies in one”: far infrared, negative ions, medical mineral Maifan Stone form compound ... and removes skin itching , improve immunityTech Data: infrared emission rate: 93%; negative ions density: about ... Please consult doctor if necessary Far Infrared Underwear