Before making the mask, first upper and lower sub mask clear, hard over, then the masks belt, above the hard kneaded in the nose, then pull down the masks.
Before fitting to the mask, first distinguish the top and bottom of the mask, the top of the hard, then put the mask on the nose, with the hard above pinch on the nose, and then pull the mask down.
Before fitting the mask, first distinguish the upper part and the lower part of the mask. The upper part is hard. Then put the mask on, pinch the hard part on the nose, and then pull the mask down