#mask.protective_cover  a protective covering worn over the face
  supertype:  #protective_cover__protective_covering__protection  a covering that is intend to protect from damage or injury; "they had no protection from the fallout"; "wax provided protection for the floors"
  subtype:  #face_mask  mask that provides a protective covering for the face in such sports as baseball or football or hockey
     subtype:  #catcher's_mask__catcher'smask  a mask to protect the face of the catcher in baseball
        subtype:  #bar_mask__barmask  a catcher's mask with bars
        subtype:  #birdcage_mask  a catcher's mask with a strong wire face
     subtype:  #face_guard  face mask consisting of a strong wire mesh on the front of football helmets
     subtype:  #fencing_mask__fencingmask__fencer's_mask  a face mask made of fine mesh that is worn over a fencer's face
     subtype:  #ski_mask__skimask  a woolen face mask to protect the face from cold while skiing
  subtype:  #gasmask__respirator__gas_helmet__gashelmet  a mask with a filter protects the face an lungs against poisonous gases
  subtype:  #welder's_mask  a mask that you wear for protection when doing welding

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