It is small because it is a cup type so human eyes are hard to care. Making is solid. On the other hand, lack of flexibility, even if trying to fit it is hard to combine strongly with its restoring power. A little leak from the side of the nose. As a cup type, feeling narrow in the mask is worrisome about steaming and breathing when wearing for a long time. Although the performance value of the filter alone is also a guide, I would like you to record well the information on the breath-esque measures fit.