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.