They fit well on my large head (hat size 7-7/8-8), don't fog up and the temples are flat enough, my ears don't miss a sound when I wear glasses. They meet US and European standards for ballistic rated lenses, are optically perfect as far as I can tell, fit very snugly together front and side with little air gap, and have suffered two ricochets over the years while shooting. It makes me feel a lot safer than glasses from the hardware store. What I really like is the easy lens change. I tried a competitor model and had to return them after my fingers started bleeding, switching from one lens to the other five times in hopes they would heal and feel lighter. They didn't. I've tried all four lens colors and am starting to see how colors can improve contrast or reduce eye strain in different lighting conditions. money well spent for me.
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