Head Cover Email $32.00 SKU: B19HBCCH-M 40% Silver fibers, 50% Bamboo fiber, 10% Spandex. This brimless head-cover can be worn under hats, caps and other head apparels. Colour Charcoal Size S Back to: Shop Ask a question With shipment Tracked Shipping for $8.60 Description Specification Care STARTING RIGHT AT THE TOP. This brimless head-cover is light and comfortable and to be worn under your favorite headwear. We can’t imagine the brand without them.Tested and designed with care, and has a soft textured finish with a fold that can be easily adjusted to the perfect fit.It offers protection to reduce signals like WiFi, Bluetooth, 4G/5G cellphone radiation.Comes in two sizes M for adults and S for children. Attenuation 99.99% Frequency Range 10MHz~10GHz Conductivity < 1 ohm / cm Suitable for: * * 5G: Partial attenuation tested up to 40GHz. What does all this mean? Hand wash - up to 30º C / 86º F Do not bleach Drip dry Dry in shade Do not iron Do not dry clean Click here for more on fabric care.