Fabric: 30% metal (non-lead metal) fiber, 55% cotton, 15% polyester. Comfortable and safe on skin.nThe fabric provides 35dB RF radiation attenuation from 10M Hz to 3GHz and beyondnWear this dress top to reduce the risks of everyday radiation for your unborn child, it blocks excess RF radiation but not for fully blocking cell phone signals purposenMaternity sizes: 45.6 inches (116 cm) at chest; 52 inches (132 cm) at belley, 53.5 inches (136 cm) at hem and 30 inches (76 cm) long; Color: Purple.nCare, hand wash, air dry, do not bleach, do not dry clean. Be certain itu0026#39;s authentic OurSure BrandnOurSure LLC is only an authorized seller for OurSure Brand products. The quality and efficacy of OurSure products is our priority. The only way to ensure you are buying authentic products is to purchase them through OurSure store at Amazon. Shielding effectiveness of OurSure textile products was tested by accredited institutes and verified to have up to 30-35 dB shielding effectiveness for 25%-35% metal blend fabrics .This dress top reduces risks of everyday RF radiation. It blocks excess RF radiation but not for fully blocking cell phone signals purpose. OurSure products made with 100% Silver nylon blend fabrics are suggested for completely shielding cell phone signals.