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This T-Shirt is specially designed for shielding Radio Frequency (RF) radiation such as cell phone, wireless devices, microwave oven. The high-tech conductive textiles are Lightweight, breathable, comfortable, and safe on skin. Sliver-nylon blend fabric is by far the best RF shield fabric used for apparels in the market. It offers exceptional RF/microwave shielding performance. The fabrics undergo rigorous testing and have up to 60 dB shielding effectiveness for frequencies 10 MHz to 3 GHz and beyond.