Sena Helmets

Size CM IN Hat Size (IN)
SM 55-56 21 1/2  – 21 7/8 6 7/8 – 7       
MD 57-58 22 1/4  – 22 5/8 7 1/8 – 7 1/4 
LG 59-60 23 – 23 1/2 7 3/8 – 7 1/2
XL 61-62 23 7/8 – 24 1/4 7 5/8 – 7 3/4
XXL 63-64 24 5/8 – 25     7 7/8 – 8