Boston Celtics Hard Hat It's the real thing! The Stadium Hard Hat is adjustable for head sizes 6.5 to 8. They meet OSHA requirements, meets or exceeds ANSI Z89.1-1986 Class A & B standards, and ANSI Z89.1-1997 Class G & E standards. Other features are: tough lightweight protection, patented shock absorbing suspension, slotted to accept attachments, anti-glare peak. Made by WinCraft. Made By Wincraft, Inc. Everything for the Sports Addict!