Adult Helmet Sizing Chart

Impact Racing Size:	Small	Medium	Large	Extra Large
Hat Size Equivalent:	6-7/8 to 7	7-1/8 to 7-1/4	7-3/8 to 7-1/2	7-5/8 to 7-3/4
Inch Size Equivalent:	21-5/8 to 22	22-1/2 to 22-3/4	23-1/4 to 23-5/8	24 to 24-1/2
CM Size Equivalent:	55 to 56	57 to 58	59 to 60	61 to 62

Youth Helmet Sizing Chart

Impact Racing Size:	Small Two Inserts	Medium One Insert	Large No Inserts
Hat Size Equivalent:	6-1/8 to 6-1/4	6-3/8 to 6-1/2	6-5/8 to 6-3/4
Inch Size Equivalent:	19 to 19-1/4	19-1/2 to 20	20-1/2 to 21
CM Size Equivalent:	49 to 50	51 to 52	53 to 54

As with all personal safety devices, helmet fit is vitally important and can increase the risk of injury if not properly fit. Carefully measure the head approximately one inch above the eyebrows across a point at the back of the head that gives the largest measurement. Please remember: Helmets will "break in" with use. It is important that the helmet fits as tight as one can comfortably withstand to wear.