Vest Anti-Radiation Safe and Healthy Pregnancy Belt Cover Belly Band - XL - Black The inner layer of the product is 97% silver fiber, 3% nylon, successfully blocking radiation. The outer layer is 97% bamboo, 3% spandex. Imported Reduces radiation by up to 100%, FCC Certified Laboratories tested and proven Complementing you figure, Comfortable to wear, Silky soft Anti-bacterial, Air penetrable, Water resistant