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Sena Cycling Helmets Size Chart

Adult Cycling Helmets
Size Head (cm) Head (in)
S 50 - 55 19 5/8 - 21 3/4
M 55 - 58 21 3/4 - 22 7/8
L 58 - 62 22 7/8 - 24 1/2

Sizing information is provided by the manufacturer and does not guarantee a perfect fit. Please use this chart as a guide only.