Smith Helmet Size Chart

Adult Helmets

Size Head Circumference (cm)
Small 51 - 55
Medium 55 -59
Large 59 - 63
X Large 63 - 67

Holt & Junior Helmets 

Size Head Circumference (cm)
Youth Small 48 - 53
Youth Medium 53 - 58
X Small 52 - 54
Small 54 - 56
Medium 56 - 58
Large 58 - 60
X Large 60 - 62