Ventilated MTB frame for maximum air flow Bulletproof 170° WideVision RideViz MTB Lens MaxiVent 40mm anti-slip mesh strap to prevent helmet vent blocking Permanent anti-fog function built into the lens Self-draining open lower frame design allows dirt to fall from lens OTG - Over-the-glasses fit Dual-layer, anti-sweat face foam Bulletproof lens tested to: ANSI Z87.1-2015 Military Ballistic Impact Standard (MIL-DTL-43511D) Complies with PPE Directive (EU) 2016/425.