Z1R Helmet Sizing

Manufacturer's Suggested Size Chart (Not a guarantee of fit) 
Manufacturer's Note: Measure head 1" or 2.5cm above brow for best fit
Size Inches Centimeters  Hat Size
2XS 20 - 20(1/2) 51 - 52 6(3/8) - 6(1/2)
XS 20(7/8) - 21(1/4) 53 - 54 6(5/8) - 6(3/4)
SM 21(5/8) - 22 55 - 56 6(7/8) - 7
MD 22(1/2) - 22(7/8) 57 - 58 7(1/8) - 7(1/4)
LG 23(1/4) - 23(5/8) 59 - 60 7(3/8) - 7(1/2)
XL 24 - 24(3/8) 61 - 62 7(5/8) - 7(3/4)
2XL 24(3/4) - 25(1/4) 63 - 64 7(7/8) - 8