Polarized sunglasses are great for other outdoor and sports activities, such as cricket , football, golfing and tennis, since they can help to sharpen the focus on the ball. They can also be good for driving, since polarized lenses reduce the glare that reflects from the shiny hood of a car, or the glare from the surface of the road on a hot, sunny day. Polarized sunglasses are especially popular with boaters, since water is a very reflective surface on a sunny day.