Is it permissible for a woman to uncover her face during Hajj?

Question:
Is it permissible (for a woman) to uncover herself during Hajj?

Answer:
She does not wear the niqab, but she covers her face with something other than the niqab: with a khimar or the like that covers the face, in a way that does not prevent her from walking. She makes a covering that does not prevent her from walking and looking at the road, but it is not the niqab.
The niqab is the burqu' placed on the face, specific to the face, which has one or two openings. This is called the niqab. The Prophet (peace and blessings be upon him) prohibited wearing it for the woman in the state of ihram. The same applies to gloves on her hands while she is in ihram, but she covers her hands and face with something else. Aisha (may Allah be pleased with her) said: "We were with the Prophet (peace and blessings be upon him) during Hajj, and when men came near us, one of us would lower her jilbab over her face," or she said: "her khimar over her face," "and when they moved away, we uncovered."