Standard Pack = 1 piece(s). Indirect-vent frame provides protection against splash and dust. Soft vinyl goggle body conforms to facial contours for a comfortable, custom fit. High impact resistance protects against flying particles. Double lens consists of polycarbonate lens on the outer side with acetate anti-fog lens on inner side. Dual pane lens ensures ultimate anti-fog performance. Ideal for use over Long periods of time. The thermal system provides anti-fog protection in extreme weather conditions. Fits over prescription glasses. Fully adjustable band.