Facial hair is often the cause of a lot of headaches when it comes to getting a seal against your face. The hair will get caught between the skirt and the skin. Water can and will get into the dive mask this way. There are some things you can do though. First, you can shave a small area of your face where the seal hits the skin to prevent any hair from being in the way in those areas. Another possibility is to use silicone paste that you put on your beard hair. It'll allow the skirt to produce a tighter seal against your skin and beard, but it usually is not a correctly working solution. Some masks are better or worse if you have a beard. We have collected more information in our post on the best masks for snorkeling and scuba diving when you have a mustache!