| 摘要 |
A mask is revealed. The mask includes an upper construction surface and a lower construction surface, respectively disposed above and under a middle construction surface and having a main body that is arranged above and under a middle construction surface. The upper construction surface and/or the lower construction surface further include an extended part. The upper, lower and middle construction surfaces are folded to form a flat folded structure. In use, the upper and the lower construction surfaces are folded in opposite directions to form a 3D mask. The mask are formed of one construction surface or two construction surfaces or more construction surfaces. By the extended part, the mask is applied to users with various face shapes and sizes. Moreover, the air leakage is reduced and the filter efficiency is increased.
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