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Pro Tec Skateboarding Helmet Size Chart

Head MeasurementSize
51 cm - 52 cm / 20.1 in - 20.5 inXS
53 cm - 54 cm / 20.9 in - 21.3 inS
55 cm - 56 cm / 21.7 in - 22.0 inM
57 cm - 58 cm / 22.4 in - 22.8 inL
59 cm - 60 cm / 23.2 in - 23.6 inXL
61 cm - 62 cm / 24.0 in - 24.4 inXXL