Shield EMFs with This Attractive T-Shirt Shields the body from a range of radiation exposure between 30kHz to 3GHz up to 75% reduction Contains 2% pure silver content for electromagnetic protection Pure Silver serves as a natural bacterial deterrent Materials: 90% cotton, 8% polyamide, 2% Silver Washing Instructions: Gentle wash (104) with TexCare, do not use bleach or chemical detergents. Do not tumble dry. Iron with low heat.