MLB Hard Hat, One Size These hard hats meet the requirements of OSHA as per ANSIZ89.1-1986 class A and B, and ANSIZ89.1-1997 Class G and E standards. Features adjustable headband for sizes 6 1/2" - 8". Made in the USA Complies with OSHA Regulations for industrial head protection. Pre-lock suspension system to help provide a comfortable fit. Has an anti-glare peak that is slotted to accept attachments