Hearing protection for a loud band

So I'm doing monitors for a notoriously loud band. Any recommendations for some hearing protection? I have custom molds that are -9db but I don't think that will be enough.

Also if you have some any other tips for a pm5d or doing monitors for a crazy loud band that's unorganized I'll take that too.

Edit: maybe something over the ears possible as headphones also. One of my friends said ill need to get vocals to 105db in the wedge.