If you’re fishing, you really want them to cut glare so you can peer down through water and and sight fish. As a fly angler for quite a few years now, I’ve worn almost exclusively Costa sunglasses when on the water. I got into them a few years back when I heard they were making frames from salvaged plastic fishing nets. If you’re used to polarized lenses made from plastic, glass is like seeing an entirely different plane of existence. But my glasses with plastic lenses inevitably get so scratched they become near useless at a certain point.