3M™ Hard Hat H-700 Series with 4-Point Ratchet Suspension and UVicator™ Sensor is comfortable, tough and lightweight protective headgear that helps protect the top of the head due to the potential hazard of small falling objects or exposed fixed objects that may be bumped into. The UVicator sensor changes color as the hard hat is exposed to UV light. The sun’s UV rays can cause a hard hat shell to become brittle and compromise its ability to protect the wearer.