A:
Even though this is mesh the mesh will "clog" with moisture over a period of time during the hunt causing the moisture to now go upwards to your glasses and they will fog. This should not be to big of an issue on warmer hunts but on colder hunts it will be worse. I would recommend to use a anti fog spray on your glasses to help prevent them form fogging over.
Answered on 4/17/2012 by Art from 3Rivers Archery