Safety bump cap and Baseball cap in one.Removable high-density ABS shell provides baseball bump cap good impact resistance and protection from minor bumps.It can reduce pressure on head and neck muscles while working in the low-risk industries that dont require full hard hat protection.Dense breathable mesh on both side of hard cap allows maximum airflow between workers head and bump cap, keeping you cool and comfortable.Providing a better ventilation while doing hard physical work or high temperature workplace environment. Made of 100% pure cotton about outer material.made of polyethylene PE about inner material.The integrated ABS shell enhances the impact absorption capacity of the baseball hard hat.