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Anti-fog The upper breathable and hollow out anti-fog structure increases the air circulation in the inner ventilation of the glasses to reduce the fog. At the same time, reduce the field of vision occlusion. Ventilation The inner lining rubber is the groove sawtooth type of the design.It is effective fit with the perspiration skin to prevent sliding down during the movement. At the same time, the vent of the groove reduces the fog. PC＋Medical silicone side wing The main material of the frame is made of lighter polycarbonate (PC) material with excellent electrical insulating, extension dimensional stability and chemical resistance. Soft and elastic, comfortable while provide wider protection ,it can be worn in big or small head size. human-oriented design details The frame & headband can be removed for easy cleaning. Adjustable headband design The headband is more comfortable to wear which is free to adjust the length.