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Fits Sizes 20.9 to 21.3 in (53 to 54 cm.) Pro-tecÆs exclusive Lo-Pro 2-stage foam skate helmets are what put us in the books by offering maximum comfort and a light, airy feel. Outlawed in some states and revered in others. Not Certified: (These helmets use 2-stage foam that does not meet certification standards and should only be used for skating)