Adult Impact Sizing Chart: Vapor, Charger, Velocity

Impact Racing Size: Small Medium Large X-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 Eqivalent: 55 to 56 57 to 58 59 to 60 61 to 62

Youth Impact Sizing Chart: Lil' Champ

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 Eqivalent: 49 to 50 51 to 52 53 to 54