--- It is more than ok, its an ok. beanie HAT. --- -Silver is anti-microbial and anti-odor -Safe and effective shielding -Durable construction -Timeless Style -Washable and skin-safe -Color: mottled light gray color on the cotton side, silver color on the other side -Shields RF 40-50dB (more than 99.99%) over at least 10MHz to 4GHz -Ground-able -Anti static -Silver eliminates odors -Washable and safe for skin contact (see the washing instructions below) Washing Instructions: 1) Softly wash by hand, with neutral detergent such as TexCare (Don’t use any strongly alkaline detergent such as washing powder) 2) Water temperature below 40°C 3) DO NOT use detergent with bleach ingredients. DO NOT bleach 4) Hang dry. Do not wring, do not hang in direct sun for a long time, and pick up promptly from the water to dry 5) Do not dry clean Chemically unsuitable water quality can corrode or damage the fine silver fibers. In particular some well waters containing sulfur, fluoridated city water, or low-PH water can react with silver in a way that degrades its conductivity and shielding performance. Because it is made using non-contiguious panels, unlike some of our other products this hat does not form a complete faraday cage and may only offer partial rf/emf insulation.