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[Satisfaction Guarantee]:I hope you will be satisfied every purchase. If you are not satisfied with the ordered product, just send us your question by email and we will reply you within 24 hours. [Advanced Technology]: use of silver coating technology, which is characterized by toughness and strong shielding. Effective protection against electromagnetic waves. [Breathable Fabric]:This radiation protection hat is made of silver fiber. Soft, breathable, lightweight and well made. [Applicable people]: shield the electromagnetic waves generated by computers, printers, photocopiers, microwave ovens and other electronic devices to meet people's radiation protection needs. People who frequently come into contact with computers and pregnant women. [Washable]:The silver fiber protective cap can be washed by hand. It does not damage radiation protection, does not deform or fade. Note: Do not machine wash, bleach or dry clean.