From the manufacturer

The NEW Velocity Photochromic lens is a bulletproof, permanent anti-fog, WideVision lens, allowing you to look ahead without fear of roost or loose gravel. The photochromic lens seamlessly adapts to changing UV light levels, providing the perfect tint for optimal visibility at all times.

Features

• Seamlessly adapts to light levels
  
  
• Bulletproof
  
  
• 2.7mm thick optically correct lens
  
  
• Permanent laminated anti-fog lens
  
  
• Tear-off and roll-off ready with posts