The CrossBlade Tri-Tech Fit frame features a snug fit with zero pressure points. Advanced ClearZone Dual Flow Coated lenses are engineered to eliminate fog inside and prevent scratches outside. Distortion-free ESSOPTICS keep your vision razor sharp and the DedBolt Lens Lock pivot allows for rapid lens exchanges. Lasers can cause severe retina damage and ESS Laser Protective Lenses (LPL) are specifically formulated to maximize protection against direct, reflected and scattered laser beams and radiation. Laser protective lenses block a specific wavelength or set of wavelengths of light that can be either visible or invisible to the naked eye. The amount or strength that LPL's block those wavelengths is called the Optical Density (OD). ESS LPL's are designed to allow the most amount of visible light transmittance (high VLT) to pass through the lenses for operational versatility in all environments while maintaining the greatest OD available to provide laser protection.