It's easy to understand why cyclists often forget to apply sunscreen. The air is moving over your skin as you ride, giving you a cool, comfortable feeling. Yet, since rides can take an hour to several hours to complete, this cooling breeze is fooling your senses. Your exposure to the sun is still as damaging as if you were lying on the beach for that same amount of time. Only, on the beach at least you'd turn over or get in the shade when you've had enough. On the bike, the same parts are exposed for the entire time you're riding, with little or no relief. From your neck and shoulders to your arms, legs, and your nose, all exposed areas need sunscreen to shield you from the damaging UV rays. Even on cloudy days you still need protection. Carry sunscreen with you and reapply as you need it.