Clothing that has thermal properties generates a high amount of negative ions. Layering on top of the undergarments will increase negative ion absorptions throughout the body. This is highly recommended for people with chronic health conditions as it provides a full body coverage.
Negative ion undergarments are key to keeping your vital organs healthy. If you wear a top (t-shirt, tank, or camisole) and a bottom (underwear or panties/briefs), you are covered in the core sections of your body.