Our bump caps are constructed from lightweight, thermal plastic. The bump caps have air holes on both sides of cap for ventilation and feature a 4-point standard suspension that is easy to adjust. Soft foam sweatband is removable and washable. This cap is not designed to meet the ANSI Z89.1 1997 class C, G, & E. Use only to protect from minor bumps and scalp lacerations. Bump caps can adjust from size 6 1/2 to size 8.