Feature:1. Good Protection: Silver fiber refers to a composite fiber formed by infiltrating nano silver ions into nylon fibers, which generates induced current through a loop composed of silver fibers inside the fabric. The induced current generates a reverse EMF for shielding. Silver has good conductors that can reflect electromagnetic waves, that is, when the aperture of the metal mesh is less than 1/4 of the electromagnetic wave length, electromagnetic waves cannot pass through the metal mesh.2. Ideal Fabric Ratio: Elastic and comfortable, with a perfect fit that is not too tight, with the right proportion to match, soft and comfortable, fitting the head without being too tight, comfortable to wear and not easily falling off.3. Comfy Wearing: Gently wrapped, resistant to radiation, excellent protective fabric, brings a comfortable experience, not stuffy, and has good breathability.4. The Parameter: 57cm hat circumference, 27cm hat height, 28cm flat hat circumference, elastic hat, suitable for both men and women, due to manual measurement, there may be a small error of 13 cm, which is normal.5. For Various Occasion: Suitable for both men and women, beautiful and generous, with high appearance value and strong affinity. It is very suitable for going out for shopping, office work, rest, fitness and entertainment.Specification:Item Type: EMF HatProduct Material: Silver Fiber, CottonProduct Features: Gentle wrapping, radiation resistance, excellent protective fabric, providing a comfortable experience, not stuffy, and good breathability. .Package List:1 xEMF HatNote:Gently rub and hand wash, do not use a washing machine to wash.