Ultrasonic goggle shaped ergonomically design with a super panoramic lens, soft face and nose pads, a clever ventilation system and an infinitely adjustable, extra-wide headband. The lens, made of polycarbonate, is easily replaceable and is available with the supervision HC-AF (Hard Coated Anti-Fog) coating. This unique technology guarantees a scratch-resistant surface as well as permanent anti-fog properties on the inside of the lens.　　Recommendations for use: Grinding work, acid work and galvanization, dusty　environments、Compliant with requirement of DIN EN 166