Marucci Adult Batting Helmet Size Chart
	Size	Head Measurement	Fitted Hat Size
	X-Small	18 3/4-21"	6-6 3/4
	Small	18 7/8-21 1/2"	6 3/8-6 7/8
	Medium	21 1/2-22 5/8"	6 7/8-7 1/4
	Large	22 5/8-24"	7 1/4-7 5/8

Size chart is a general guide. It may include sizes that are unavailable for this item. Measured horizontally around the largest cross-section of the skull, usually 1" above the eyebrows and against the top of the ears.