Product name: diving maskProduct Composition:Frame, lining: polypropylene, siliconeMirror: Polycarbonate-ABS resin tubeValve port: polycarbonate-ABS resinIf the measurement size is greater than 10cm and less than 12cm (4,8"), select MIf the measurement size is greater than 12cm (4,8"), select L sizeWearing instructions:1. Close the chin of the face from under the mask and adjust the position when wearing it;2. After wearing, adjust the webbing on both sides of the mask to a comfortable length;3. After adjusting, comb your forehead hair out of the mask to ensure that the hair around the face is not pressed;4. After combing, press and hold the mask to buckle on the face. Swing left and right to ensure that it will not be thrown away. If you feel a drop, please tighten the webbing.Welcome to Mzlx store，please rest assured to buy,if you have any questions, please feel free to contact us