O'Neal Racing Adult Helmets Size Chart

8 Series Factor Helmet
Helmets
Size Inches
X-Small 20 1/2" - 21 1/8"
Small 21 1/4" - 22 1/8"
Medium 22 3/8" - 23 1/8"
Large 23 1/4" - 23 3/4"
X-Large 23 7/8" - 24 3/4"
2X-Large 24 7/8" - 25 3/4"

To measure your correct helmet size, measure the circumference of the head, like a headband - one inch above the eyebrows - above the ears. Match inch measurement to the chart. If between sizes, choose the next larger size. Helmet should fit snugly but not overly tight.

Sizing information is provided by the manufacturer and does not guarantee a perfect fit. Please use this chart as a guide only.