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this is a reused shield that can be washed and with replaceable filtersactivated carbon filter shield, absorption of odor, effectively purify the air1. sports protective equipment, widely used, to protect your sports, and to meet the health needs of more sports people. suitable for badminton, basketball, running, skiing, mountaineering, cycling, etc. 2. surround protection, breathable and comfortable sports fabric, dustproof and sandproof, and you can breathe comfortable and healthy fresh air.