With the Uvicator sensor, you'll know when your hard hat's been in the sun too long. Professional hard hats help protect the wearer by absorbing impact energy. Over time, the sun's UV rays can cause a hard hat shell to become brittle and compromise its ability to protect the wearer. With the 3M H-700 Series hard hat with Uvicator sensor, you'll know when it's time to replace a hard hat due to extended UV exposure. The sensor changes color from red to White as the hard hat is exposed to UV light, alerting the wearer that it's time for a replacement. This innovative, award-winning, lightweight hard hat offers all the features and performance of the H-700 Series, and now with the addition of the Uvicator sensor, it's an even better choice for extended comfort and protection.