3M Hard Hats are engineered to provide comfort, protection, balance, and stability to help keep DIYers and professionals safe. 3M Non vented Hard Hat with Ratchet Adjustment for custom, on head sizing. Suspension sits lower on the head to reduce pressure points and increase security. Features a smooth turning 4 point ratchet suspension system and provides optimized comfort with 3 levels of height adjustment. Part of the 3M Pro Series Safety Products line, this hard hat was designed for the way pros think, the way they shop and the way they work.