Description: 1. Cap circumference 58-64cm, visor width: 7.5cm, cap depth: 12cm 2. Made with high quality material in order to provide the best protection, such as Wi-Fi Modems, Bluetooth devices in the home and car, smart meters, cell towers, microwaves, cordless phones, as well as low frequency electrical fields from sources such as electrical wires, electrical box, Household appliances and high power transmission lines. 3. Protect you from devices like WiFi routers, baby monitors, cell phones, bluetooth and laptops in daily life. 4. Materials: Out layer: Cotton; inner layer: silver fiber knitting 5. Care: Hand wash, air dry, do not bleach Specifications: Color: Black, navy blue, royal blue Package include: 1 x cap includs:1 x cap
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