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Pro Tec Skateboarding Helmet Size Chart

Head Measurement Size
52 cm - 54 cm / 20.5 - 21.3" XS
54 cm - 56 cm / 21.3 - 22" S
56 cm - 58 cm / 22 - 22.8" M
58 cm - 60 cm / 22.8 - 23.6" L
60 cm - 62 cm / 23.6 - 24.4" XL
62 cm - 64 cm / 24.4 - 25.2" XXL

Jr Head Measurement Size
47 cm - 49 cm / 18.5 - 19.3" XXXS
49 cm - 51 cm / 19.3 - 20.0" XXS
52 cm - 54 cm / 20.5 - 21.3" XS
54 cm - 56 cm / 21.3 - 22.0" S