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ProTec Helmets Size Chart

Helmet SizingX-SmallSmallMediumLargeX-LargeXX-Large
Head Circumference (CM)52 - 5454 - 5656 - 5858 - 6060 - 6262 - 64
Head Circumference (IN)20.5 - 21.321.3 - 22.022.0 - 22.822.8 - 23.623.6 - 24.424.4 - 25.2
Hat Size6 1/2 - 3/46 7/8 - 7 1/87 1/8 - 3/87 3/8 - 5/87 5/8 - 7/87 7/8 - UP