Product specifications: Size: 13.8 * 6.3 In Material: nylon and spandex Function: windbreak dust Usage occasion: Suitable for running, cycling, hiking, skiing, crafts, gardening, anonymous and other outdoor activities. Suitable for children, the elderly, pregnant women, women, men, teenagers, etc. Steps on how to replace the filter cotton: 1. Open the product to expose the inside of the filter valve. 2. Rotate the valve counterclockwise according to the opening direction on the valve to separate the valve. 3. Remove the filter. 4. Replace with a new filter and follow the reverse steps above to rotate the valve clockwise. Note: 1. The product can be washed, but the filter pad cannot be washed, it is recommended to replace the filter pad after 7 days of use. 2. Before use, please insert the filter pad in the same way as shown in the picture.
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