Fits over prescription glasses. Soft vinyl goggle body conforms to facial contours. Goggle provides protection against dust and chemical splash. Removable vent caps allow the user to remove when more. ventilation is required or leave in place for unsurpassed chemical splash resistance. GG504T and GG504TM passes D3: Droplet and Splash Test provides protection from droplets and splashes. Passes Ballistic MIL-PRF-32432 High Velocity Impact standards.