To determine which size helmet is right for you, measure (in inches) the circumference of your head just above your ears and refer to the chart for sizing.

Each brand has specific sizing, which can be found on the appropriate products page.

The table below is Rawlings Helmet Sizing Chart.

Size	Hat Size	Head Circumference (Inches)
Small	6 5/8 - 6 3/4	20 3/4" - 21 1/4"
Medium	6 7/8 - 7	21 1/2" - 22"
Large	7 1/8 - 7 1/4	22 1/4" - 22 3/4"
X Large	7 3/8 - 7 3/4	23" - 23 1/2"