This lens is unfoggable!!! I have played with these in almost every single possible condition from dry heat to raining nights. I have even gone to indoor fiels where the humidty is higher. Never a single bit of dogging the clarity of the lens are also amazing. Perfect clarity giving you the best sight while shooting. The lens are also tought as hell taking apart a I3 is not easy and these lens hold up to the stress welll.
I3 Thermal Mask Lens 
