Clear window on the mask provides more visual access to the lips and facial expression of the users. This enables persons who are deaf or hard of hearing to lip-read the persons they are communicating with for better understanding of their speech or conversation, especially during pandemic situations when it is essential to wear a mask. It can also be used by anyone who needs to enable others to have a clear view of his or her own face so that other persons can decipher his or her expression or speech better while wearing a mask, e.g. preschooler teachers whose students need to observe the lips movement of the teachers while learning how to speak better.