To be effective, a face shield should not:
An effective face shield should be free of scratches, be resistant to penetration, allow clear views to both sides, fasten securely, permit air to pass through, and provide enough space for eyeglasses or sunglasses to be worn underneath. It is important for a face shield to permit the passage of air because an airtight face shield can create fogging and make it difficult for a rider to see.
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