Sunglasses for Bikers Sunglasses for bikers do more than just protect against UV radiation and dazzle. The plastic lenses also prevent dust and insects getting into your eyes. Many sunglasses in the Louis range are also specially shaped to divert the airstream away from your eyes. If you're in any doubt about which to choose, you can order two or three different models to compare. Louis will take back any item that does not fit or which you do not like.