Bulletproof with Anti-fog Lens. The Leatt Velocity 4.0 MTB goggle is the perfect goggle for warmer climates. It has specially designed vents in the goggle frame and lens as well as a unique mesh strap which ensures helmet ventilation still functions even when covered. The 4.0 MTB goggle won the 2021 Design and Innovation Award for its great ventilation qualities. This goggle is the first goggle in the Leatt range to feature the RideViz lens. A three-layer laminated, anti-fog, bullet proof, and anti-scratch lens which ensures you have clear vision and the best protection for your eyes, along with great looks and the perfect fit, all this at a price that won't break the bank! Ventilated MTB frame for maximum airflow. Bulletproof 170° WideVision RideViz MTB Lens. MaxiVent 40 mm anti-slip mesh strap to prevent helmet vent blocking. Permanent anti-fog function built into the lens.