Sena Sizing Chart

Adult Helmets

Size Hat Size Inches Centimeters
XS 6 5/8 - 6 3/4 20 7/8 - 21 1/4 53 - 54
S 6 7/8 - 7 21 5/8 - 22 55 - 56
M 7 1/8 - 7 1/4 22 1/2 - 22 3/4 57 - 58
L 7 3/8 -7 1/2 23 1/4 - 23 5/8 59 - 60
XL 7 5/8 - 7 3/4 24 - 24 3/4 61 - 62
2XL 7 7/8 - 8 24 3/4 - 25 1/8 63 - 64