Motorcycle helmet shield stickers, also known as shield decals and visor decals, are perforated stickers specifically designed to fit on the windscreen of a motorcycle helmet. They're mostly cosmetic, but can offer some incoming light reduction and act like a tint. They can also protect your windscreen from scratches. While most helmet shield stickers are a generic shape, some are a simple rectangle and require a lot of trimming, others are shaped like your helmets windscreen and may only require some minor trimming. Some shield stickers are solid, very thin, and not see through. Those are applied to the top of your helmets windscreen to block out the sun, or for decoration. Shield stickers made from vinyl are best because they are extremely durable. Motorcycle helmet shield stickers CAN reduce visibility, how much depends on your helmet, eyesight, point of focus, and more.