| 摘要 |
A face mask includes a hollow mask body, a crosswise strap having two ends secured to two sides of the mask body, and a lengthwise strap having a first end secured to an upper portion of the mask body and a second end extended through a mediate portion of the crosswise strap and removably attached to a face of the lengthwise strap. Thus, the crosswise strap and the lengthwise strap form an intersecting face which holds the user's head closely so that the mask body is fit on the user's head snugly to prevent the face mask from slipping from the user's head due to a larger action, such as violent vibration or impact.
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