Product details:

100% Silver-Nylon Blend Do not dry clean Ware this light stretch t-shirt as a basic top or an undershirt to protect you from all-day Radio Frequency (RF) radiation 100% silver-nylon blend fabric provides RF radiation shielding to 3 GHz and beyond Size: chest-42" (107 cm), length-28.3" (72 cm), shoulder--19" (48 cm); the shoulder size has been modified from 17" to 19" according to customer's suggestions Care, hand wash, air dry, do not bleach, do not dry clean Breathable and comfortable. Be certain it’s authentic OurSure Brand OurSure 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. 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 from 10 MHz to 3 GHz and beyond.