I have made and bought dozens of pairs of blinders for shooting but most are flimsy or easily forgotten at home but this company has a good idea and they stay put. They do make a difference with face fatigue,from squinting, in those long days looking through my scope at chucks! I even use one on my spoting scope. I have a range card taped to the back so I can read my clicks fast. Eye Blind $20.00 gets it delivered to your door.