Back in high school, my best friend and I headed to Florida for our Spring Break. Her uncle was a beach cop at the time, and we decided to tag along with him to work one day. How very Baywatch of us. Let's just say that a lack of proper sunscreen protection and a very long day of lounging at the beach was not a good idea. How I wish I had the UVSunSense ($5 for seven) wristband back then, a new form of sun protection that helps prevent overexposure to the sun.

Developed by a nuclear physicist, this wristband measures exposure to the ultraviolet radiation found in sunlight. To use, you must apply an SPF of 15 or higher to your body and the band, as the band adjusts based on the SPF you use.

Like Homeland Security codes for your skin, four color indicators alert you of your sun status: orange, the color of the band when it's removed from the package; purple, which indicates it's been activated in the sun; dark brown, meaning it's time to reapply sunscreen; and salmon, which suggests you've had enough. Bonus? It works in water, so you can swim and float to your heart's delight.